imo, using led's, and expecting to get great results, is like using brews to make co2, a waste. for overall yield, which is what a lot, if not most folks are after, led's don't get it done. electrical costs aren't so great that it is a deal breaker using hid lighting. i don't see any large scale producers using led's, i wonder why??? do they work? yes they work. is there anything better to grow with? yes, hid is better. especially if yield matters to you...