Bought a 10-pack of the 10W bulbs about five years ago for a picture frame light that burns at least six hours per day. I have since saved a fortune over individual bulbs at my local stores. They last as long as any other halogen bulb I've used. This current batch of 20W bulbs keeps a few landscape lights happy. As long as you are not blasting them with way over 12 volts, the life expectancy is pretty good. For those having issues with quick burnouts, I suspect their power supplies might be running a little high. Make sure you handle the bulb with a tissue or piece of paper when installing.