Ok this is my 1 year anniversary with quantum boards.
240 w 400 k ( dimmed ) in 2x4 tent veg.
600 w 3000 k with red and uv (dimmed) 4x4 flower tent.
After using HPS and quantum boards I have to say hps is easier to get big dense buds with. I hear a whole bunch of numbers chucked around from...
Its about 5” above the canopy. I have a vented hood with a 6” hyperfan pushing through it . Seperate 6” hyperfan sucking through scrubber. Its the radiant heat from that hps lamp that is much hotter than the MH was.