That middle bulb is 5500 and should not be used on a reef, IMO
. 6500k is about the yellowest bulb you would want.
5500-6500 = yellow light
10000k = white light
10k - 20k = white to blue light
20000k = blueish light
6500 Iwaskis are supposed to be awesome for coral frowth but they have a yellow tint. You can suppliment with actinic but I would just go for something between 10k and 20k. I use Coral Vue 14ks and and love them. I also suppliment with actinic so I get a blueish white light. I had 10k's before and liked them. 14k's seem to be the rave right now too
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,