{"id":87173,"date":"2022-05-04T00:00:00","date_gmt":"2022-05-03T22:00:00","guid":{"rendered":"https:\/\/www.growbarato.net\/blog\/light-radiation-affects-cannabis-plants\/"},"modified":"2026-08-31T16:42:19","modified_gmt":"2026-08-31T14:42:19","slug":"effects-of-light-radiation-on-plants","status":"publish","type":"post","link":"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/","title":{"rendered":"Effects of light radiation on plants"},"content":{"rendered":"\n<p>The <strong>effects of light radiation on plants<\/strong> go far beyond photosynthesis. Light influences growth, internodal distance, flowering, resin production, leaf color, and the plant&#8217;s response to environmental stress.<\/p>\n\n\n\n<p>Each part of the light spectrum can trigger a different reaction. Blue, red, green, ultraviolet, and far-red light intervene differently in the plant&#8217;s physiological processes, which is why not all light sources produce the same results.<\/p>\n\n\n\n<p>Understanding how light radiation acts is key in both outdoor and indoor crops, where the grower can better control the type of light, intensity, distance, and photoperiod.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-6a9c4b640dc4d\" class=\"ez-toc-cssicon-toggle-label\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Contenido<\/p>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a9c4b640dc4d\"  \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#What_is_light_radiation_in_plants\" >What is light radiation in plants?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Main_effects_of_light_radiation_on_plants\" >Main effects of light radiation on plants<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Photosynthetically_Active_Radiation_or_PAR\" >Photosynthetically Active Radiation or PAR<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Blue_light\" >Blue light<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Red_light\" >Red light<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Far-red\" >Far-red<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Green_light\" >Green light<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#How_does_light_influence_photosynthesis\" >How does light influence photosynthesis?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Effects_of_ultraviolet_radiation_on_plants\" >Effects of ultraviolet radiation on plants<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#UV-A_rays\" >UV-A rays<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#UV-B_rays\" >UV-B rays<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#UV-C_rays\" >UV-C rays<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#How_do_plants_defend_themselves_from_UV_radiation\" >How do plants defend themselves from UV radiation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Effects_of_light_radiation_on_plants_cannabis_plants\" >Effects of light radiation on plants (cannabis plants)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Light_spectrum_in_indoor_cultivation\" >Light spectrum in indoor cultivation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Summary_table_of_the_light_spectrum_in_plants\" >Summary table of the light spectrum in plants<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Tips_for_better_use_of_light_in_indoor_cultivation\" >Tips for better use of light in indoor cultivation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#FAQs_about_the_effects_of_light_radiation_on_plants\" >FAQs about the effects of light radiation on plants<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Is_UV_light_necessary_in_all_crops\" >Is UV light necessary in all crops?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Can_a_plant_gradually_get_used_to_more_intense_light\" >Can a plant gradually get used to more intense light?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Is_white_light_or_purple_light_better_for_cultivation\" >Is white light or purple light better for cultivation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#Can_a_plant_receive_good_light_and_still_grow_poorly\" >Can a plant receive good light and still grow poorly?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/#When_should_you_check_if_the_lighting_is_well_adjusted\" >When should you check if the lighting is well adjusted?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_light_radiation_in_plants\"><\/span>What is light radiation in plants?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Light radiation is the <strong>energy from light<\/strong> that reaches the plant. This radiation can come <strong>from the sun or from artificial lighting systems<\/strong>, such as <a href=\"https:\/\/www.gbthegreenbrand.com\/130-led-lighting\" data-type=\"link\" data-id=\"https:\/\/www.growbarato.net\/130-focos-marihuana-iluminacion-led\">LED grow lights<\/a>, <a href=\"https:\/\/www.gbthegreenbrand.com\/409-lec-lighting\" data-type=\"link\" data-id=\"https:\/\/www.growbarato.net\/409-iluminacion-lec\">LEC<\/a> equipment, <a href=\"https:\/\/www.gbthegreenbrand.com\/hid-grow-lights-high-intensity-discharge-bulbs\/5929-gb-lighting-600w-hps-pro-bulb.html\" data-type=\"link\" data-id=\"https:\/\/www.growbarato.net\/bombillas-para-marihuana-interior\/5929-bombilla-hps-pro-600w-gb-lighting.html\">HPS<\/a>, or other systems used in indoor cultivation.<\/p>\n\n\n\n<p>Plants do not use all light in the same way. Some wavelengths are used directly in photosynthesis, while others intervene in processes related to growth orientation, flowering, germination, pigment production, or defense mechanisms.<\/p>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Main_effects_of_light_radiation_on_plants\"><\/span>Main effects of light radiation on plants<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The effects of light radiation on plants can be seen in practically all stages of cultivation. Proper lighting promotes healthy and balanced development, while insufficient, excessive, or poorly distributed light can cause visible problems in leaves, stems, and flowers.<\/p>\n\n\n\n<p>Among the main effects of light on plants are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Activation of photosynthesis.<\/li>\n\n\n\n<li>Development of leaves, stems, and roots.<\/li>\n\n\n\n<li>Regulation of internodal distance.<\/li>\n\n\n\n<li>Production of pigments and antioxidant compounds.<\/li>\n\n\n\n<li>Response to light stress.<\/li>\n\n\n\n<li>Changes in the shape, size, and orientation of leaves.<\/li>\n\n\n\n<li>Production of resin and secondary metabolites in certain species.<\/li>\n<\/ul>\n\n\n\n<p>That is why, in cultivation, it is not enough to just provide light. The type of light, the quantity, the distance to the light source, the photoperiod, and the moment of the cycle in which the plant is located also matter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Photosynthetically_Active_Radiation_or_PAR\"><\/span>Photosynthetically Active Radiation or PAR<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The part of light that plants mainly use to perform photosynthesis is known as photosynthetically active radiation, also called <strong>PAR<\/strong>. This is found approximately between <strong>400 and 700 nm<\/strong> (nanometers), within the visible spectrum.<\/p>\n\n\n\n<p>Within that range, not all zones act the same. Each color or wavelength can influence different aspects of plant development.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"450\" src=\"https:\/\/www.growbarato.net\/blog\/wp-content\/uploads\/2021\/09\/luz-plantas.png\" alt=\"Infographic on the light spectrum and the effects of light radiation on plants according to different types of sunlight and ultraviolet light.\" class=\"wp-image-230318\" srcset=\"https:\/\/www.gbthegreenbrand.com\/blog\/wp-content\/uploads\/2021\/09\/luz-plantas.png 1000w, https:\/\/www.gbthegreenbrand.com\/blog\/wp-content\/uploads\/2021\/09\/luz-plantas-300x135.png 300w, https:\/\/www.gbthegreenbrand.com\/blog\/wp-content\/uploads\/2021\/09\/luz-plantas-768x346.png 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Blue_light\"><\/span>Blue light<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Blue light, located approximately between <strong>400 and 500 nm<\/strong>, is important during the growth phase. It helps the plant develop a more compact structure, healthy leaves, and strong stems.<\/p>\n\n\n\n<p>When blue light is lacking, some plants can stretch too much and show weaker stems or a greater distance between nodes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Red_light\"><\/span>Red light<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Red light is found approximately between <strong>600 and 700 nm<\/strong>. It is one of the most important zones for photosynthesis and also plays a prominent role in flowering and the general development of the plant.<\/p>\n\n\n\n<p>In indoor cultivation, it usually has special importance during flowering, as it is related to the formation of flowers and the plant&#8217;s energy utilization.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Far-red\"><\/span>Far-red<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Far-red is found above <strong>700 nm<\/strong> and is related to phytochromes, receptors that help the plant interpret light and shadow.<\/p>\n\n\n\n<p>When there is too much far-red, the plant can stretch more as it interprets that it is competing for light. Therefore, it is advisable to work with balanced spectra.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Green_light\"><\/span>Green light<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>For a long time, it was thought that green light was practically useless for plants because a part of it is reflected, giving leaves their characteristic color. However, it can also play an interesting role.<\/p>\n\n\n\n<p>It can penetrate better into internal areas of the plant canopy, helping light reach lower or less exposed leaves.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_does_light_influence_photosynthesis\"><\/span>How does light influence photosynthesis?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Photosynthesis is one of the most important processes within the effects of light radiation on plants. Thanks to it, plants <strong>transform energy from light into chemical energy<\/strong> to be able to grow and develop.<\/p>\n\n\n\n<p>This process takes place in the <strong>chloroplasts<\/strong>, where pigments such as chlorophyll are found, responsible for capturing light radiation. From there, the plant produces sugars, releases oxygen, and obtains energy to form roots, stems, leaves, flowers, and fruits.<\/p>\n\n\n\n<p>When light is insufficient, photosynthesis is reduced and the plant can grow weaker, with thin stems, small leaves, and lower production. However, an excess of light can also cause light stress, burns, or loss of vigor. Therefore, the important thing is to adjust the intensity, spectrum, and distance of the light source well according to the cultivation phase.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Effects_of_ultraviolet_radiation_on_plants\"><\/span>Effects of ultraviolet radiation on plants<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The ultraviolet radiation is found below the visible spectrum and is mainly divided into <strong>UV-A, UV-B, and UV-C<\/strong>. Although it represents a minor part of the radiation a plant receives, it can have significant effects on its physiology, morphology, and defense mechanisms.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"450\" src=\"https:\/\/www.growbarato.net\/blog\/wp-content\/uploads\/2021\/09\/radiacion-uv.png\" alt=\"Illustration of UV-A, UV-B, and UV-C radiation filtered by the atmosphere.\" class=\"wp-image-230336\" srcset=\"https:\/\/www.gbthegreenbrand.com\/blog\/wp-content\/uploads\/2021\/09\/radiacion-uv.png 1000w, https:\/\/www.gbthegreenbrand.com\/blog\/wp-content\/uploads\/2021\/09\/radiacion-uv-300x135.png 300w, https:\/\/www.gbthegreenbrand.com\/blog\/wp-content\/uploads\/2021\/09\/radiacion-uv-768x346.png 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"UV-A_rays\"><\/span>UV-A rays<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>It is the <strong>least energetic<\/strong> within the ultraviolet range. It can influence some physiological processes and certain plant responses, especially when combined with other parts of the spectrum.<\/p>\n\n\n\n<p>In cultivation, UV-A can participate in responses related to <strong>pigments, natural defenses, and secondary compounds<\/strong>. However, its effects depend heavily on the species, intensity, exposure time, and the general state of the plant.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"UV-B_rays\"><\/span>UV-B rays<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>It is more energetic than UV-A and can cause <strong>more marked responses in plants<\/strong>. In small doses and under controlled conditions, it can activate defense mechanisms and promote the production of certain protective compounds.<\/p>\n\n\n\n<p>In some species, exposure to UV-B has been linked to changes in <strong>flavonoids, pigments, trichomes<\/strong>, and other secondary metabolites. In the case of cannabis, its possible influence on the production of resin and cannabinoids is often mentioned, although it should not be understood as an automatic formula to increase potency.<\/p>\n\n\n\n<p>An <strong>excess<\/strong> of UV-B can <strong>reduce photosynthesis<\/strong>, slow down growth, damage plant tissues, or generate stress. Therefore, if lighting with a UV component is used, it must always be done with control and without assuming that more ultraviolet radiation means better results.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"UV-C_rays\"><\/span>UV-C rays<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>It is the most energetic and also the <strong>most aggressive<\/strong>. In natural conditions, a large part of this radiation is filtered by the atmosphere before reaching the Earth&#8217;s surface.<\/p>\n\n\n\n<p>In plants, <strong>high exposure<\/strong> to UV-C can <strong>damage tissues<\/strong>, affect DNA, and cause serious development problems. For this reason, it is not used as conventional grow lighting and must be treated with special care.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_do_plants_defend_themselves_from_UV_radiation\"><\/span>How do plants defend themselves from UV radiation?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Plants have developed different mechanisms to protect themselves from ultraviolet radiation and excess received radiation.<\/p>\n\n\n\n<p>Among the most common defenses are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increased production of protective waxes on the leaf surface.<\/li>\n\n\n\n<li>Increased cuticle thickness.<\/li>\n\n\n\n<li>Production of flavonoids and other antioxidant compounds.<\/li>\n\n\n\n<li>Changes in size and other antioxidant compounds.<\/li>\n\n\n\n<li>Changes in leaf size and orientation.<\/li>\n\n\n\n<li>Reduction of leaf area to limit exposure.<\/li>\n\n\n\n<li>Increased lignin synthesis in some tissues.<\/li>\n\n\n\n<li>Activation of cellular repair mechanisms.<\/li>\n<\/ul>\n\n\n\n<p>In cannabis, trichome production can also be part of the plant&#8217;s defensive response to different environmental factors, including intense light, UV radiation, dryness, or pest pressure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Effects_of_light_radiation_on_plants_cannabis_plants\"><\/span>Effects of light radiation on plants (cannabis plants)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In cannabis cultivation, light plays a fundamental role from germination to harvest. It not only determines the growth rate but also the plant&#8217;s structure, internodal distance, flower formation, resin production, and final yield.<\/p>\n\n\n\n<p>During the <strong>growth phase<\/strong>, proper lighting helps achieve strong plants with resistant stems and good leaf mass. In this stage, blue light plays an important role because it promotes more compact and balanced growth.<\/p>\n\n\n\n<p>During <strong>flowering<\/strong>, the plant needs intense and stable lighting to form dense flowers and maximize its productive capacity. In this phase, red light takes on greater prominence, although the ideal is to work with a full spectrum that provides a more balanced response.<\/p>\n\n\n\n<p>It is also important to <strong>control the distance between the light source and the plants<\/strong>. If the light is too far away, the plant may stretch excessively in search of light. If it is too close, burns, claw-shaped leaves, discolorations, or light stress may appear.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Light_spectrum_in_indoor_cultivation\"><\/span>Light spectrum in indoor cultivation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In indoor cultivation, the grower has the advantage of being able to choose the type of lighting and better control environmental conditions. However, they also have the responsibility of providing adequate light in each phase.<\/p>\n\n\n\n<p>When choosing a <a href=\"https:\/\/www.gbthegreenbrand.com\/49-plant-lighting\">lighting system for indoor cultivation<\/a>, it is not advisable to look only at several factors. You must also take into account efficiency, spectrum, coverage, recommended distance, heat generated, and light distribution over the crop.<\/p>\n\n\n\n<p>Full-spectrum LED grow lights for cannabis have become a widely used option. These allow covering different phases of cultivation with more efficient consumption and lower heat emission than other traditional systems.<\/p>\n\n\n\n<p>However, even with good equipment, it is necessary to adjust the height, power, and photoperiod well. Powerful but poorly placed lighting can create areas with excess light and others with a lack of intensity, affecting the general development of the crop.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary_table_of_the_light_spectrum_in_plants\"><\/span>Summary table of the light spectrum in plants<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<table style=\"width: 100%; border-collapse: collapse;\"> <thead> <tr style=\"background-color: #1e252c; color: white; font-weight: bold;\"> <th style=\"padding: 8px; border: 1px solid #ddd;\">Type of radiation<\/th> <th style=\"padding: 8px; border: 1px solid #ddd;\">Approximate range<\/th> <th style=\"padding: 8px; border: 1px solid #ddd;\">Main effect on plants<\/th> <\/tr> <\/thead> <tbody> <tr> <td style=\"padding: 8px; border: 1px solid #ddd; background-color: #00a58c; color: white; font-weight: bold;\">UV-C<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">100-280 nm<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">Very energetic radiation, can damage tissues and DNA<\/td> <\/tr> <tr> <td style=\"padding: 8px; border: 1px solid #ddd; background-color: #00a58c; color: white; font-weight: bold;\">UV-B<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">280-315 nm<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">Activates defenses, can generate stress and morphological changes<\/td> <\/tr> <tr> <td style=\"padding: 8px; border: 1px solid #ddd; background-color: #00a58c; color: white; font-weight: bold;\">UV-A<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">315-400 nm<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">Influences pigments, defenses, and physiological responses<\/td> <\/tr> <tr> <td style=\"padding: 8px; border: 1px solid #ddd; background-color: #00a58c; color: white; font-weight: bold;\">Blue light<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">400-500 nm<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">Promotes compact growth, leaves, and vegetative development<\/td> <\/tr> <tr> <td style=\"padding: 8px; border: 1px solid #ddd; background-color: #00a58c; color: white; font-weight: bold;\">Green light<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">500-570 nm<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">Penetrates better into internal areas of the plant canopy<\/td> <\/tr> <tr> <td style=\"padding: 8px; border: 1px solid #ddd; background-color: #00a58c; color: white; font-weight: bold;\">Red light<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">600-700 nm<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">Key in photosynthesis, flowering, and general development<\/td> <\/tr> <tr> <td style=\"padding: 8px; border: 1px solid #ddd; background-color: #00a58c; color: white; font-weight: bold;\">Far-red<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">700-740 nm<\/td> <td style=\"padding: 8px; border: 1px solid #ddd;\">Influences phytochromes, elongation, and shade response<\/td> <\/tr> <\/tbody> <\/table>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tips_for_better_use_of_light_in_indoor_cultivation\"><\/span>Tips for better use of light in indoor cultivation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For the effects of light radiation on plants to be positive, it is important to work in a balanced way. These tips can help improve crop performance.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Choose a light source suitable for the size of the grow tent or room.<\/li>\n\n\n\n<li>Maintain the correct distance between the light and the tips of the plants.<\/li>\n\n\n\n<li>Avoid sudden changes in intensity.<\/li>\n\n\n\n<li>Ensure good ventilation to control temperature.<\/li>\n\n\n\n<li>Check that the light reaches the entire surface homogeneously.<\/li>\n\n\n\n<li>Adjust the photoperiod according to the growth or flowering phase.<\/li>\n\n\n\n<li>Observe the leaves to detect signs of light stress.<\/li>\n\n\n\n<li>Do not abuse UV radiation if its use is not well controlled.<\/li>\n<\/ul>\n\n\n\n<p>The key is to find a balance between intensity, spectrum, and environment. A plant can only make good use of light if the other cultivation factors are also correctly adjusted.<\/p>\n\n\n\n<style>\n    .accordion-container {\n      width: 100%;\n      margin: 0 0 20px;\n      clear:both;\n    }\nh3.accordion-titulo {\n    margin-bottom: 0;\n    margin-top: 2%;\n}\n    .accordion-titulo {\n      position: relative;\n      display: block;\n      padding: 10px 20px;\n      font-size: 18px;\n      font-weight: 300;\n      border: 1px solid #000;\n      color: #000;\n      text-decoration: none;\n      cursor: pointer;\n    }\n    .accordion-titulo.open {\n      color: #00ab8e;\n      border-color: #00ab8e;\n    }\n    .accordion-titulo:hover {\n      color: #00ab8e;\n      border-color: #00ab8e;\n    }\n    .accordion-titulo span.toggle-icon:before {\n      content:\"+\";\n    }\n    .accordion-titulo.open span.toggle-icon:before {\n      content:\"-\";\n    }\n    .accordion-titulo span.toggle-icon {\n      position: absolute;\n      top: 6px;\n      right: 20px;\n      font-size: 26px;\n      font-weight:bold;\n    }\n    .accordion-content {\n      display: none;\n      padding: 20px;\n      overflow: auto;\n      font-family: 'Roboto', sans-serif;\n      font-size: 16px;\n    }\n@media (max-width: 767px) {\n   h3.accordion-titulo {\n    padding-right: 12%;\n   }\n}\n  <\/style>\n<script>\n    jQuery( document ).ready(function($) {\n      $(\".accordion-titulo\").click(function(){\n\n        var contenido = $(this).next(\".accordion-content\");\n          \n        if(contenido.css(\"display\")==\"none\") { \/\/open\t\t\n          contenido.slideDown(250);\t\t\t\n          $(this).addClass(\"open\");\n        }\n        else { \/\/close\t\t\n          contenido.slideUp(250);\n          $(this).removeClass(\"open\");\t\n        }\n                  \n      });\n    });\n  <\/script>\n<div itemscope=\"\" itemtype=\"https:\/\/schema.org\/FAQPage\" style=\"width: 80%; max-width: 100%\">\n <h2 style=\"width: 100% !important;\"><span class=\"ez-toc-section\" id=\"FAQs_about_the_effects_of_light_radiation_on_plants\"><\/span>FAQs about the effects of light radiation on plants<span class=\"ez-toc-section-end\"><\/span><\/h2>\n  <div itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n    <h3 itemprop=\"name\" class=\"accordion-titulo\" style=\"width: 100% !important;\"><span class=\"ez-toc-section\" id=\"Is_UV_light_necessary_in_all_crops\"><\/span>Is UV light necessary in all crops?\n<span class=\"toggle-icon\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n    <div class=\"accordion-content\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n      <div itemprop=\"text\">\nNot always. UV light can influence <b>defense mechanisms and the production of certain secondary compounds<\/b>, but it is not essential in all crops. If used, it is advisable to do so with suitable equipment and controlled doses.\n      <\/div>\n    <\/div>\n  <\/div>\n  <div itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n    <h3 itemprop=\"name\" class=\"accordion-titulo\" style=\"width: 100% !important;\"><span class=\"ez-toc-section\" id=\"Can_a_plant_gradually_get_used_to_more_intense_light\"><\/span>Can a plant gradually get used to more intense light?\n<span class=\"toggle-icon\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n    <div class=\"accordion-content\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n      <div itemprop=\"text\">\nYes. Some plants can adapt progressively to higher light intensity if the change is made gradually. It is recommended to avoid going from <b>soft light to very powerful light suddenly<\/b>, as that abrupt change can cause stress, drooping leaves, or discolorations.\n    <\/div>\n  <\/div>\n<\/div>\n<div itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n  <h3 itemprop=\"name\" class=\"accordion-titulo\" style=\"width: 100% !important;\"><span class=\"ez-toc-section\" id=\"Is_white_light_or_purple_light_better_for_cultivation\"><\/span>Is white light or purple light better for cultivation?\n<span class=\"toggle-icon\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n  <div class=\"accordion-content\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n    <div itemprop=\"text\">\nIt depends on the type of equipment and the <b>actual spectrum it emits<\/b>, not just the color perceived by the human eye. Many modern white lights can offer a very balanced full spectrum, while some purple lights combine mainly red and blue. The important thing is to check the quality of the spectrum, efficiency, and coverage of the light source.\n    <\/div>\n  <\/div>\n<\/div>\n<div itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n  <h3 itemprop=\"name\" class=\"accordion-titulo\" style=\"width: 100% !important;\"><span class=\"ez-toc-section\" id=\"Can_a_plant_receive_good_light_and_still_grow_poorly\"><\/span>Can a plant receive good light and still grow poorly?\n<span class=\"toggle-icon\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n  <div class=\"accordion-content\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n    <div itemprop=\"text\">\nYes. Light is key, but it does not act alone. If there are problems with <b>watering, temperature, humidity, ventilation, substrate, or nutrition<\/b>, the plant can grow poorly even if the lighting is correct. Cultivation works as a balance between several factors.\n    <\/div>\n  <\/div>\n<\/div>\n<div itemscope=\"\" itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n  <h3 itemprop=\"name\" class=\"accordion-titulo\" style=\"width: 100% !important;\"><span class=\"ez-toc-section\" id=\"When_should_you_check_if_the_lighting_is_well_adjusted\"><\/span>When should you check if the lighting is well adjusted?\n<span class=\"toggle-icon\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n  <div class=\"accordion-content\" itemscope=\"\" itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n    <div itemprop=\"text\">\nIdeally, check the lighting every time the plant changes phase, increases significantly in size, or shows <b>strange visual signs<\/b>. It is also advisable to check it when changing the light source, modifying the power, moving pots, or adjusting the height of the lighting system.\n    <\/div>\n  <\/div>\n<\/div>\n  <\/div>\n\n\n\n<p><\/p>\n<div style='text-align:center' class='yasr-auto-insert-visitor'><\/div>","protected":false},"excerpt":{"rendered":"<p>The effects of light radiation on plants go far beyond photosynthesis. Light influences growth, internodal distance, flowering, resin production, leaf color, and the plant&#8217;s response to environmental stress. Each part of the light spectrum can trigger a different reaction. Blue, red, green, ultraviolet, and far-red light intervene differently in the plant&#8217;s physiological processes, which is\u2026 <span class=\"leermas\" onclick=\"window.location.href='https:\/\/www.gbthegreenbrand.com\/blog\/effects-of-light-radiation-on-plants\/'\">Continue reading<\/span ><\/p>\n","protected":false},"author":18,"featured_media":230298,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"wprm-recipe-roundup-name":"","wprm-recipe-roundup-description":"","yasr_overall_rating":0,"yasr_post_is_review":"","yasr_auto_insert_disabled":"","yasr_review_type":"","footnotes":""},"categories":[256,1],"tags":[],"class_list":{"0":"post-87173","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-marijuana-news","8":"category-noticias-marihuana"},"yasr_visitor_votes":{"stars_attributes":{"read_only":false,"span_bottom":false},"number_of_votes":1,"sum_votes":5},"_links":{"self":[{"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/posts\/87173","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/comments?post=87173"}],"version-history":[{"count":14,"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/posts\/87173\/revisions"}],"predecessor-version":[{"id":243540,"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/posts\/87173\/revisions\/243540"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/media\/230298"}],"wp:attachment":[{"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/media?parent=87173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/categories?post=87173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbthegreenbrand.com\/blog\/wp-json\/wp\/v2\/tags?post=87173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}