magiccannabus, thanks for dropping in and for the nice comments. The plants are vegging under CLF's(?) (LowEnergy lamps) right now, I am not using any mercury lamps yet. I wanted to use them for foliarpenetration later in the veg. Do you have a good reason why I should'nt use it?
It just doesn't have a good growing spectrum. I think you might actually be able to put a metal halide bulb in that same fixture. I know with 400W M59 ballasts, they run either type. Not sure with your ballast, but it's likely. If you could put a metal halide bulb in there instead, you'd get better results. Even a single CFL in there might out perform that mercury lamp.