Custom Sea Life Smartlite is 50/50, one is blue actinic, the other is 10,000k and produces no yellow tint at all. My tank is 55g tall, i have a 2 x 96w retro (actinic & 6700k) in the front, and dissembled my smartlite canopy and installed the smartlite in the back, makes it 3 x 96w. The 6700k bulb in the center is yellower compare to the 10,000k smartlite, but still wonderful and no yellow tint. Initially i wanted MH bulb so i could keep whatever i wanted, but the bulb would only be 2" away from the plastic splash cover, so heat would be a problem; then i thought about vho, but the actual vho bulbs measure a bit more than 36", and wouldn't fit into my canopy, so i had no choice but ordered the pc retro and modified my original smartlite. So far I like it very much. I have mostly soft corals and they thrive, i also have 2 crocea clams on the top lr that i thought wouldn't live thru these lights, but its almost 9 months they are still colorful, especially one that recovers well after being knocked down by some fish or crab and had damaged skins, it's all gone and well attached to lr. I think sea life pc are wonderful, but you should also consider MH bulbs if you have enough space in canopy, price about the same.