They sent me it as a replacement for the bulb that failed on me. The replacement burnt out in 3 hours. I don't use them for basking lamps after the first failure but I set up Carliles 20 gal tank on my fireplace hearth so he can hang out with us upstairs and figured may as well use that bulb. He usually lives in the basement out of the dogs view because they think he is a squirrel. I think he needs a radio or something downstairs so it's not dead silent all the time.