i had to get in touch with the seller to find out specifics because i dont like NOT knowing about my own stuff LOL....but apparently my light ratio is i have (32) 660nm,(24)630nm,(8)460nm,(12)470nm,(12)3500k and (12)7500k....don't know a whole lot about PAR but best I can tell from my research, those are at least some of the right things I need to grow,,,Im about to find out I guess....but really though..I have heard alot of bad things about some LED's but this one really seems to be well put together. Time will tell I guess.