I run the Coralvue 2x250/T5 retro. Affordable and nice quality. 250's did not burn anything in my tank but I did do the photo acclimation as mentioned on the articles page. I still have a softie dominant tank but I have SPS
as well. I hope to get a clam sometime.
Make sure you consider the heat aspect. 250's will generate some heat. I have a closed canopy so I had to put 2 fans blowing out and 1 blowing in. Heat still hits 84 on some days depending on humidity/temp in the room.
As for the color of the bulbs, depends on the manafacturer and the color you like. I am planning on getting 14ks to replace my 10k's but some 14's are real blue and some are not. I like the color of my 10k's with T5 actinics but would like a touch more blue.
*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,