So here is an update,
I have not yet had even an ok pull using the SK600s, it might be me and my newbieness using LED's. I have only pulled .5g / watt , I used to pull .9 g/watt with DE HPS's. The quality is also shit compared to what I normally do. Gotta say I am really disappointed and feeling like I have had one pulled over on me. I plan on running these lights one more month and then deciding wither to stay the course or switch back to HPS.
Sad sad thing, I have looked on You tube to see if anyone had done a video of an impressive sk600 grow I haven't seen anything of any real quality.
At this point I will say SK stay away