I'm rocking 4 autocobs, one over each plant. They are led, but normal lighting (not too yellow, and not purple). 55 w a piece, but are equivalent to 150 w hps. My 4 plants yielded 7.57 oz altogether, which is equivalent to about 1.28 g /w (I actually only had 3 lights for this grow). That was my very first grow, deficiencies and all.
My energy bill went up $20/month. My tent never gets above 79, they are completely silent. No ballast, just plug-n-play.
I love these little guys, and will always recommend them when people are shopping around for lights.
I can't comment on the lec's because I have never used them, but most people have good things to say about them it seems.