i have 15k reef grow bulbs, the color is great.....not sure of the par value or anything since sanjay hasnt tested them yet....wish i had a set of iwakis 14k, i hear lots of good things about them, i havent seen any great growth with these bulbs i have had about 3 weeks now, the only thing is i have sprouted 2 mushrooms out from under the rockworks,and also 3 kenya sprouts haves shown up.....wish i would have something else at least something that has been tested and proven besides these bulbs.....