LED Grow Light

Using LED Grow Lights For Cannabis: 6 Mistakes to Avoid-Part I

Growing great cannabis is not really difficult—at least in theory. Get yourself some quality cannabis seeds, good soil, proper containers, and you’re already off to a good start. However, if there’s one factor that’s especially crucial to developing superb cannabis, it’s light—a lot of it. Indeed, cannabis plants require more light than most other plants, and they optimise performance if light exposure is significant and consistent. As such, you really don’t want to skimp when it comes to your grow lights.

In the past, weed cultivators largely used HID lights—with MH (metal halide) lights used for vegging and HPS (high pressure sodium) lights employed for flowering. However, LEDs are exponentially taking over grow rooms around the world. Why? Compared to HID, LEDs have some convincing advantages: They use (a lot) less electricity, allowing you to save money over time and reduce the footprint you leave on the environment. They also emit less heat, which can be a big advantage, especially in small grow setups. Lastly, LEDs have recently become more affordable as the tech has become widespread, allowing home growers an opportunity to benefit from this unique and powerful lighting system.

Yet, even the fanciest LED lights cannot prevent growers from making mistakes in their grow. Let’s delve into some common errors, slips, and faux pas to avoid when growing cannabis with LEDs.


This is probably the most common mistake that inexperienced growers make upon just starting out with LEDs. Since HID lights emit a lot of heat, out-of-the-loop growers might be overly cautious with their LEDs, placing them too far away; alternatively, those aware of the benefits of LEDs might get cocky and place the lights super close. If you hang your LEDs too far away, there’s a good chance your plants will over-stretch in an effort to reach closer to the light. If, on the other hand, you place your LEDs too close to your cannabis plants, this can stress the plants more than they can comfortably handle, causing burning and bleaching of the foliage and buds.

So, what is the ideal distance between your grow lights and your plant canopy? Unfortunately, there is no standard, since the best distance during the vegetative and bloom phases of your cannabis will depend on your specific LED. Each type can vary slightly, therefore affecting the final distance they should be from your plants. You can check with our Aokairuisi Team for any information on recommended distance. (Contact Us) Under normal conditions, you can keep your LEDs somewhere between 30–45cm from the canopy—around 45cm during veg, then a little closer when your plants are flowering.

When adjusting the height of your LEDs for peak performance, keep an eye out for any oddities. Dry, curled, brown, or bleached leaves signal too much light, calling for your LEDs to be raised higher. 


Because good HID lights emit a lot more heat than LEDs, soil normally dries out quicker when utilising the former. Once growers make the switch, however, they often forget to take this into account. Given the significant reduction in heat, it’s likely your plants will need less frequent watering. So adjust your schedule accordingly when using LEDs, especially if you’re new to it. Overwatering is a common and sometimes serious error beginners make that paves the way for a host of pests and diseases to take hold. So this is really important to keep an eye out for. When in doubt, let your soil dry out—then you can water again.

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