OneReef
Reef Guru
This thing is sweet, got to see it in person at Memfish. The LED pendant Eotech Radion has cool white, blue, royal blue, hyper red and green LEDs. Hooked up to a computer you can adjust the color of each LED color to get the exact color that you want. It's nice. A bit pricey, but nice. Here's a picture of the computer screen with the adjustable colors, then a short video of it in "Demo Mode":
