Kessil also a very nice choice. They do look very nice just not as versitile.
Careful if you go with the deep blue. They will change the colors of some of your fish esp. anything yellow. I had the light on one of my tanks and wasn't happy about the color change myself.
Yup, most folks who got the 15k lights returned them for the 10k and reporting they look more like 12k.
Also, Kessil is strongly rumored to have new products coming out in the first half of 2012. I've exchanged an email or two with their sales staff, they're not willing to let slip what they have coming but said they're looking to address the same issues I asked them about. Namely the ability to control the lights - possibly with more than 2 channels (ie. they would be adding different color LED's to the matrix), and when will the larger LED light they've had on the market for indoor gardening be released with aquarium spectrums.
I'm watching Kessil to see what they come out with because I think they're the only manufacturer actually bringing new innovations to market, every other LED manufacturer is just repackaging the same CREE, Rebel and Osram LED's that we can buy and build ourselves. Check out the video on their main webpage on the Spectral Halo light, this is the larger light I'm waiting for an aquarium version of. What's cool about it is the vapor exchange cooling plate they're using in conjunction with the heat sink and fan.
