I got a good deal on a Rapid LED PAR38 so I jumped on that, but if I didn't I was going to give this aquatraders light a try for my 4g pico. I ordered the 20" version for my Betta's tank, so I'll report back. They're the same LEDs as the bigger versions.
If you're on a budget, it may be worth a try. Yes, it's Chinese Odyssea, but I had a good experience with their T5 fixtures for non critical tasks like freshwater and softies. You know the deal, YMMV. But once I get my light on Friday, I'll bump this thread.
http://www.aquatraders.com/LED-Reef-Bright-p/56211.htm