Here is a link to ArttyFish's thread about the LED lights. He used 2 10w LED's placed directly on top of the tank which makes it look brighter.
http://www.monsterfishkeepers.com/forums/showthread.php?384594-ArttyFish-Mixed-Pygo-Shoal-LED-Shimmering-Effect-Set-Up&highlight=artyfish
http://www.monsterfishkeepers.com/forums/showthread.php?384594-ArttyFish-Mixed-Pygo-Shoal-LED-Shimmering-Effect-Set-Up&highlight=artyfish