Sorry, didn't get this in the first post [ dumbass me, eh? ]. Well, that low kelvin [ red spectrum, in other words ] Metal Halide bulb you posted a link for should do it if you wanted to substitute for the lack of HPS light.
Kush Over Reviewed by Kush Over on . LIGHTING QUESTIONS I've got this 1kw MH ballast that I've been running for a few years now with a single, 400w MH bulb. I use the 400w because 1000w of MH turns my 28x28" growing area into an easy-cook oven, and because I believe that I end up with close to the same effective lumens as the 1000w by bringing the bulb closer to the plants. The 400w is the standard "blue spectrum" kind that's discussed here a lot. I think I'd like to add some red spectrum for flowering. I've been reading this forum about mercury Rating: 5