I've used a couple of these in the past, and so far pretty good luck. http://www.atlanticwatergardens.com/lighting.html
Of course there's no specs, but the color is fairly warm (the cold side of the claimed 3000K probably), and light output is good, though I cannot quantify it. Probably similar to a 10w halogen source? Cheap enough that you could afford to get one to try out firsthand.