I use Vipraspectra LEDS (Rated# 3)You do mean 31.5 per plant avg eh? I've never used LEDs but from what I gather the cheap ones are no good, I've heard good things about gavita but you're looking at $600-800 just for a thousand watt equivalent.
You'll do much better with the HIDs but dont run a 600w bulb with a thousand watt ballast that's a serious fire hazard.
520 watts to produce such so little par is mind bogglingI use Vipraspectra LEDS (Rated# 3)
ADVANCED PLATINUM SERIES (#1)
But a 600 watter is around $ 700 !
This LED is the finest electromagnetic wavelength producer, fine tuned for Cannibis, UVB and Far Reds. I'm saving now. P.S. 2- 600 watters are cheaper than 1 -1200 watter, same/Vipraspectra
Grow god520 watts to produce such so little par is mind boggling