I'm gonna venture an opinion and say there is way too many of them. On average one LED per 20-24 inches of tank length is about average.......Sometimes "cheap" is not really what is best.......LED's are dirt cheap to buy, easy as heck to assemble, and in all reality you can get buy without soldering if that scares you.......
Neat thing about DIY moon lights is you can simply add in a UV led light and it makes things so much more different, espeically coraline algae. If it looked good under actinic or lunar lights its awesome under a mix of moon/ lunar and some UV led's.