Originally Posted by zachrockbadenof
i use 2 315's in a 4x3.5ft tent... imo that is not enough light- grew 6plants, and getting 2oz's per plant- not a great production- HOWEVER the 2 cmh's complete were 360bucks (180per) - i doubt u can get get similar light production from an led unless u spend 3 or 4x's the $360.. n i purchased 2 phillips argo bulbs for 49bucks each - i think the bulbs cost more now (bought em 6mos ago) but i am sure i will get at least 3grows from em, and it would take years to add up what 1 'good' led costs-
I'm finding better production by keeping them 20"-24" from plant tops (4plants). Closer, I was getting slower growth. I'm in a 4'x4' tent and also running them hotter than usual, 82F lights on, 75F lights off, RH 60% high to 49% low.. allot of early trimming (up to week 3 of bloom).
EDIT: my bulbs cost $139 phillips.