Oh, I didn't meant they are not good, they are better then hps in their own regard, but for the same watt (no matter big or small space) it's better to use a bulb that produce the most light.Pretty strong statement to say they are a waste when there are so many documented successful grows that use them. You're basically focusing your preferences on yield. GPW
I'll put a 400w hps in a 80 x 80 over a 315w or even the old 360w cdm anyday, 25k more lm.
And then you can say, but the spectrum is crazy good on those cdm and cmh, that's the balance for the less 25k lm, but I will reply that spectrum changes (from the hps to cmh range for this purpose) are marginal at the end product in terms of quality, sure the cmh will be better, but will it be worth to lose 25k lm better ?
For the pure hobbiest sure, I agree.
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