In my experience these lamps last about a year or just under 3700 hours (with an average usage of 10 hours a day. I use these lamps outdoors under flooding, used for "bathing" I like everything about these bulbs except the relatively short lifespan. The temperature of the light (3000K) is perfect, it's a bright, clear light with just the right amount of heat. I don't like that these bulbs are that much Heat is given off by incandescent bulbs, no more need to remove fried bugs from bulbs in the warmer months.I like the shorter lifespan and then have to replace them after a little over 1/3 of their advertised lifespan.