i currently run 6 bulb fixture:3 ATI Blue+, ATI Purple plus, ATI aquablue special, giesman mid-day(6K), this has a very crisp white look. Before i ran 4 blue+, Purple+, GE 65K, coral colors popped but very blue. i choose my combo after reading grimreefer's website on t5: http://home.comcast.net/~stevelarsen00/site/?/home/