The coralife PC bulbs in my experience are great. My 12 gallon has 1 x 26w Actinic and 1 x 26w Daylight 50/50. These two little 13 inch bulbs are able to grow SPS Monitopra digitata sp. among other things quite well in my nano.
http://canreef.com/vbulletin/showthread.php?t=55172
http://canreef.com/vbulletin/showthread.php?t=55172