We have 8 lights that use them. I've always bought these bulbs but they burn out every time I order them. They're designed to fail after 2000 hours, but ours don't even last that long. Some of the last boxes only lasted a few months and were shot. The same bulbs have lasted more than a year in the same lamp. I will try another brand next time. I have exceeded the maximum price of a product with degrading quality. I remember they used to only be rated for 2000 hours and lasted years instead of weeks. You can make a much better and longer lasting lightbulb for the same price. But this is not in the interest of Philips. The faster they burn out, the more you buy. sigh.