I'm looking for a cheap but effective LED for my new 4 gallon pico. Would this work? I know that many of the colors will not be useful for coral growth, but this is the easiest and cheapest 10w LED I can find that gives me the choice of turning on both white and blue lighting.
http://www.ebay.com/itm/390708305121?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
http://www.ebay.com/itm/390708305121?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649