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OK, now to throw a wrench into it: what if the HPS was 400w instead of 600w? Would HPS remain the most effective? As for the math (which might be wrong), I would calculate the CFLs to produce roughly 65,000 lumens, the 600w HPS 64,000 lumens and the MH 54,000 lumens. Can't really accurately...

OK, if cost was not an issue (either for upfront purchase of bulbs/equipment or electrical costs), given the choice between the following, can you please place in order of best possible yield? Assume each light array is same distance from plant canopy and all other variables are equal. (This...