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Can you use a Metal Halide lamp in a High Pressure Sodium ballast? From the little research I've done, the short answer is yes. With all things being equal, matched wattage to ballast, a MH lamp will fire and run appropriately. I do not have a strong understanding on the why's. Something...

So basically, the summary: how to build a floating COB LED illuminated aqua/hydroponic solar powered grow room out of a shelled out houseboat. It needs to be able to draw ~1.2-3.6kW/h or 21.6-64.8kW/day. Multi-farad capacitors? Tesla's Powerwall? Constant current. Running DC? No sloppy...