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800w Grow Light in 2x2x5' Grow Space.

shane369

shane369

New member
Hi everyone! It's my first time growing my own cannabis, as of now I'm using a BESTVA 800W dual chip LED grow light in a 2' x 2' x 5' grow space. I'm worrying that the light's too much for my plants. For my very first grow, I fitted 3 plants in my grow box, of which are 2 Royal Dwarf Autos, 10 days old and a 7 days old, and a landrace form my country, 13 days old. I started it on a 16/8 light schedule but recently changed it to 18/6 because I've read online that 18/6 is best for autoflowers. The temperature fluctuates around 27 - 33 degrees celcius and the humidity is from 38 - 70%, it depends on the room temperature outside the grow box. Do you guys think 800w is just right?
 
It should be fine for that size, could even take a little more light. It only draws 150 watts which provides roughly 500umols of photon density averaged over 4 squares. Which the optimal light levels are around 700umol, with maximum of 1000umol.

So as previously said, should be no problem. Just use the manufacturers recomended fixture height.
 
If its for a 4x4 space, then co2 supplementation is not required. Fresh air will be enough. With more powerful light sources or using that light source in a smaller grow area, then co2 supplementation will start becoming a requirement. :)
 
It turned out that my grow light's too much for my seedlings! My seedlings are showing light burn symptoms and they grow very slow, they are probably stunned :cry: What can I do about this? As of now I placed the grow light furthest possible almost touching the ceiling. And I covered some of the LEDs with cloth. Will this work? I'm really worried :frown:
 
Check manufacturers recommendation for seedling heights, if there is none then you really should be using lower powered light such as CFL or LED bulbs. Seedlings can only take small amounts of light for the first couple of weeks. After about 21 days you can introduce much stronger light. When a plant is bleached from too much light, the only resolution is to back the light off a lot. This is where a lux meter comes in handy.
 
It may help you to read my article on using light efficiently, yo get the concept of how much light plants can use throughout their lifecycle.
 
I am now using my two spare 15w grow light bulbs and a 5 meter RGB LED strip that I set on blue on my seedlings. I placed the bulbs around 7cm away from the seedling. I hope this works DrPhoton! Thanks for the advise!
 
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I think it will work out fine, just be careful with the light. It does take time to work out fixture heights, especially without a light meter.
 
shane369 cfls are only better in a stealth setting, for less electricity and probably a lower initial investment you can get a small HID or an LED that fits your needs better

even for seedlings I would recommend an inexpensive LED growlight even a 9w will be good for seedlings
 
I also use LEDs for germination and cloning for up to 14-21 days. They are 19w philips bulbs. You do have to have them further from the plants compared to CFL. I have mine around 12 inches from the light, but this distance will vary from the different wattage and bulb types.
 
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