If anybody is interested, there is a thread that talks about 6500K bulbs power compact fluorescent that should be suitable to a small planted tank. These bulbs are 20 Watts each and have a nice white crisp color of 6500K, unlike the 4000K (more yellowish) kinds you see for home use. It's a screw on compact fluorescent.
http://www.reefcentral.com/vbulletin/showthread.php?s=&threadid=71801
http://www.reefcentral.com/vbulletin/showthread.php?s=&threadid=71575
http://www.reefcentral.com/vbulletin/showthread.php?s=&threadid=71801
http://www.reefcentral.com/vbulletin/showthread.php?s=&threadid=71575