This one is truly a beauty.  Here is the new RGBW high-power LED from Cree.

XLAMP XM-L COLOR LED RGBW (XMLCTW-A0-0000-00C3ABB02CT-ND)

I got the mount from a company in France who makes MCPCBs, or metal-core printed circuit boards, and thanks to PayPal I was able to quickly get test out my new RGBW LEDs.  The picture above was taken with each LED using a 5V PWM driver set to match the camera saturation for each device.  Each one of these LED chips have wire-bonded contacts and are embedded into a single dielectric hemisphere.

Now I can make all of the colors!