Timers for cannabis grows

When growing cannabis indoors, the main focus is on providing light and nutrients at the right times. Photoperiod strains of cannabis (excluding autoflowering varieties) rely on specific light cycles, meaning the amount of light and darkness they receive each day directly determines their growth stages. For instance, during the vegetative phase, they need 18 hours of light and 6 hours of darkness, whereas the flowering phase requires a balanced 12 hours of light and 12 hours of darkness. However, since maintaining such precise control over these light periods can be challenging, you’ll need to find an efficient solution to automate the process.

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To properly regulate your plants’ light cycle, it’s crucial to invest in a timer. These devices connect to the light switch and automatically turn the grow lights on and off, whether you’re present or not, saving you the hassle of doing it manually. Nevertheless, not all timers are created equal, and they each have a specific amp resistance. Therefore, when selecting a timer for your grow setup, you must be cautious, as a malfunction or misstep in timing could potentially ruin your entire crop. In short, choosing the right timer is key to ensuring your plants thrive.

Some people connect multiple grow lights to a power strip plugged into an analogue timer, expecting it not to burn out. This is dangerous and can harm your plants, cause re-vegetation, or even start a fire. While some timers handle two lights, it’s safer to use timer boxes designed for controlling multiple lights securely. With a proper timer box, you can leave your grow with peace of mind.

Today we’re going to give you a list of different models of timers what how you can use them; some are used for specific things and not all of them can do the same.

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Timer Models:

Analog Timer

These timers are the culprit of many problems in indoor grows. These timers work perfectly with a single 600W light or less and are also suitable for water pumps, heaters, or ventilation devices. You can program 15-minute intervals for a full 24 hours, and the switches are easy to use—up means on, down means off. Some people try using them with two lights, but this causes the timer to stop working over time. While you might get lucky, it’s generally a bad idea to push it beyond its limits.

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Digital Timer

With this timer you’ll have more or less the same resistance to lights as the previous one. It will work perfectly with one light for years, but if you add another one it could end up breaking within weeks. This timer is extremely interesting for grows using CO2, irrigation systems, or hydroponics as you can program it by the minute and it has 8 on and off programs, as well as being able to program times for seven different days. What does all of this mean? It basically means that you will be able to precisely time your watering and other things down to the minute. You can choose which day of the week you want it to function, setting up certain times for Monday or the weekend etc. It’s a bit more complicated to use, but if you read the instructions it should be much easier to understand.

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Legrand Timer

This analog timer allows you to program 15-minute intervals to turn lights on or off. It has a higher amp resistance, making it safe to connect two 600W lights without risk of overheating or malfunction. You can also use it for ventilation or watering systems, but it’s best suited for lighting. If using a power strip, connect only two lights. While it can technically handle three, it’s safer to stick with two to avoid long-term issues.

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GSE Timer with Various Inlets

These timer boxes let you control the light cycle for 4 to 12 grow lights with a single timer. They are thermally protected to prevent fires, and an automatic shut-off switch activates in emergencies. The box spreads power across two inlets to avoid overheating, so both must be plugged in for it to work. Available models support 4x600W, 6x600W, 8x600W, or 12x600W setups, with some including a 2000W heating inlet. Always avoid using power strips with these timers, as it can cause serious issues.

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So, now you have a little guide on what timers are and what each kind of model can do. Hopefully this has helped you to figure out which one you need for your indoor grow.