LED christmas lights
There are lots of LEDs available. One of the major issues is whether or not the white ones are white, blue, or yellowish. This company provides a true white light. They also have lots of helpful guides and LED educational information on their website. LEDs for regular light sockets too!
Note that they have more products than are listed on the website. Worth a call.
A small company, excellent personal service.
http://www.imaginarycolours.com/
