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I am in the process of setting up my grow boxes. Basically, there will be two setups (one for mothers, clones and veg and the other for flower). I am making them out of 2X4's for the structure and then I am making plywood tops and bases. I will be covering the base, top and side with a 6mil...

Thank you so much, techlead, this information is extremely helpful. So, in short UV supp would be mainly beneficial in veg state, correct? Would you then recommend using UV supplementation for flowering? Since greens rate of absorption is so low, green would not be a useful supplement at any...

Thank you, that was helpful. The only problem is that I am looking for the spectrums for marijuana stages. I think mj is differing slightly from that graph and also the stages determine the amount of usable light spectrum (i.e. more blue during veg for rooting, more red/orange for flower)...

Also, is there a site to get the usable spectrum of lighting for stages of plants? I know what it is for corals (420-490nm because this is the major light that penetrates the water), but this is obviously different for plants. I know that cannabis plants do not absorb the green sprectrum...

I have a couple questions about UV that I was hoping someone could answer. First, a fairly easy question: is it more important to supplement with UV in veg or flowering or both? Second, is longwave (365nm) or shortwave (254nm) more important or should I use both? Thanks for any help...

Since I grow corals with LED's, I am fairly confident that plants can be grown under them. The question is not can they, it is what LED's can produce and what falls short. First, if you are using LED's, these units they make are not close to what you can make yourself. Use 5W 40degree angle...