I just wanted to share my new LED setup for the 4 gallon pico reef tank. I was using two GU10 1x3w cool white + 2x3w actinic for a couple of years and wanted to try something different. I ordered a 10w Chip on Board LED module, thermal epoxied it to a little heat sink, drilled some holes for wires and siliconed a glass guard for the actual LED. I'm really liking the nice white look. We'll see how the coral and shrimp like the new light. It is much less spot lighty than the GU10 bulbs.
This is the old LED
New 10W unit
And running on the tank
And FTS. Apparently I need to do a water change :P
I think I might see if I can run two units w/o the actinic on my planted 10G.