[Obi-dad]

I have had XM10, Iwasaki 15k, and the reeflux 12k on this tank. I had thought the XM looked white, but when I had the XM and Iwasaki side by side for comparison the XM looked yellow compared to the Iwasaki. The Iwasaki is not a blue bulb (even though it is listed as 15k), but is very bright. The Reeflux 12k by itself is white with a blue tinge. The blue is more noticeable when side by side with the other bulbs, not as much when by themselves.

I liked all 3 bulbs, but will be trying a 20k next - I can't resist messing with the color. When I had 6 T5s on the tank with no MH (instead of 4 now) I tried out a gazillion combos of bulbs, I guess that makes me a bulb junkie.