The Yorkshireman
Well-Known Member
Aside from 315 ceramics, SE 600s and DE lights are the most efficient HID lights available.
That's not true.
315w ceramics are crap.
The spread is nice and even but the photon intensity across the board is shit.

And the terrible performance concerning cannabis applications coupled with the cost makes 315w ceramics among the worst grow lights for cannabis available, they don't even come into it.

Economic Analysis of Greenhouse Lighting: Light Emitting Diodes vs. High Intensity Discharge Fixtures: - http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0099010
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