what lights of you have man?
if you have an "extra" 600 watts available I HIGHLY recommend using the 10k 600 watt metal halide bulb, not only does it make some seriously large trichomes, but I have had ZERO powder mold since I started using it, and i'm in a redwood rainforest, and California has gotten a WET winter and fall, not even a speck of it
I guess it could be coincidence but every harvest I have to battle the PM, and since I started the 10k I am mold-free.
didn't change anything else at all
run the 10k in an open hood, (the exhaust side)and make sure you get some good sunglasses or oxy-acetylene cutting glasses.
the same sort of concept they use in hospitals and reef tanks
worth a try, the bulb is only like 80 bucks or so
plus like I said the trichs are noticeably larger with the MH
not for use as a sole source of light though, ya gotta match it a hps
ideally 2/1
but I run a 1/1 and rotate the plants, every ten days
funny how obvious the differences are when using the different bulbs though