I wanted some LEDs to make some color pop and was wanting it on the cheap. So decided to check out what EBAY had to offer. They have all kinds of cool stuff but ended getting this:

http://cgi.ebay.com/Blue-12-LED-Flex...item3a5f100a0e

If you want something to help with color popping then these work great - only when the MH lights go off though. They overpower but I'm sure you can find something that may work a little better. Very satisfied for $10 bucks. Took a while coming from China but it was worth the wait.