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HIDs for years dude! Nice score. I got a little excited about the ballast, but then you said dimmable. So then I knew it was electronic. dont get me wrong my electronic dimmable ballasts are fucking tops amazing gear. But if you got a 400w magnetic you coulda scored in a different way.
I admire the work you do and the ideas you have about lighting, using the least amount of energy and shooting for top yields in the watts. So then you'll appreciate 400w cmh setup, 1/3-1/2 the BTU of HIDs which is the equiviliant heat of running a 150W MH not to mention that ceramic yields could be as high as 1.5g per watt which could give you well over a lb when dialed in off 400w.
Also leads me to my next question I came back to ask if you thought some 26w 5000k cfls around the perimeters for an extra 100w-200w for 4 sides of my CMHs boundary