Today on EMS Labs, Lenore has a piece on how to successfully photograph Light-Emitting Diodes:

Taking pictures of LEDs can be difficult. Digital camera sensors just don’t respond the same way that human eyes do, so it is nearly impossible to take a picture that reflects what you are seeing. But manipulating a few settings like white balance and shutter speed can improve things immensely, as can simple physical things like using a tripod.

Photographing LEDs