thedopeman
Well-Known Member
I am thinking of going with a 400 wat ballast for a 400 watt Metal halide bulb. I will be able to have the ballast outside of the grow room. Will the lioght bulb it self produce alot of heat or is the ballast that prodes alot of heat? Also Would it be possible to use a 400 watt HPS bulb from start to finish since it is need in the flowering stage?