Using LED Grow Lights For Cannabis Nov 16 , 2021
Whether you are new to growing cannabis or just new to growing with LEDs, mistakes can happen! Find out what you should avoid in order to grow top-tier cannabis under LED grow lights!

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.


1. NOT SETTING YOUR LED LIGHTS AT THE PROPER DISTANCE
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. 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.

2. OVERWATERING YOUR CANNABIS PLANT
Because good ol’ 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.

3. CHOOSING THE WRONG TYPE OF LED LIGHT
Most LED grow lights you can find today are full spectrum led grow lights, which is sort of a buzzword that means you can use them for vegging and flowering. But there are also models outfitted with a switch that allows you to change the light spectrum according to the phase. Moreover, some LEDs are made only for veg—emitting a bluish light that supports fast and vigorous growth—while others are made for bloom, giving off a reddish light to support bud development. So, before you get an LED light, make sure it’s the right type. For most growers, a full spectrum LED is likely what you'll want.

Full spectrum led grow light

4. CHOOSING LOW-QUALITY LED LIGHTS
If there’s one drawback to LED lights in comparison to HID, it’s that a quality LED is significantly more expensive outright. Not everyone has the cash upfront for a high-quality, full spectrum LED, so they look for ways to save money while still benefitting from the technology. The problem is, there are now tons of low-quality LEDs available on the internet to satisfy this very issue—and these manufacturers are not prioritising quality. These cheap LED lights are often manufactured overseas, and claim to provide more light than they’re actually capable of. Some of these lights are only able to grow one plant (if you’re lucky), and not much more. Low-quality LEDs can also be dangerous to operate if they’re made in a country that has less strict requirements on electrical safety.

5.NOT PROVIDING YOUR CANNABIS PLANTS WITH ENOUGH LIGHT
The issue with many of those cheap “beginner LEDs” is that some manufacturers intentionally confuse the grower with specs and numbers, such as wattage. This seems fine, except that, with LED lights, wattage doesn’t really say how much light the LED is emitting; it says how much energy is required to produce the light. Instead, we’re measuring in lumens—the amount of light actually emitted. So, regardless of how high the wattage is, the light could still have a poor spread and/or doesn’t penetrate the canopy well. In other words, don’t fall victim to misleading information, and consider the source of your product.


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