Review on Energy Efficient Philips 415687 Indoor 20 Watt 12 Volt: Perfect Lighting Solution for Indoor Spaces by Robert Dabney

I've also found these bulbs to burn out within three to six months, at least some of the packs I've bought. First they dim, then they flicker a little, and after another week or two they go out. This is a manufacturing defect. The inside of the bulb is not completely sealed, gas will enter or escape as they heat up, and this will cause them to fail too quickly. Will be on the lookout for anyone other than Phillips as we proceed.