Like many other forum members, I've been on a quest to convert all of my lights to LEDs, slowly but surely. My latest concentration was on the tail-light assemblies. Replaced the tail/brake lights not long ago, but wanted to tackle the back-up lights also to improve light output. Happened to run upon these for sale on eBay:

Optical Projector High Power 1156 7506 P21W LED Bulbs Powered by 7W CREE XP G H | eBay

Similar bulbs from IDJMtoys cost aroudn $35 a piece. I put in a best offer of 9.99 which was accepted, for both bulbs. Here are the results:

On the left is the new bulb, on the right, the OEM.





Sorry for the grainy night-time shot, but you get an idea of the color and light output.