I bought these lights to replace my 18v Black & Decker flashlight. The 90261 bulb is very popular and is used in many 18 volt flashlights. It fit perfectly, and the replacement cost was about half the cost of the B&D lamps sold at my two local lumber shops. There is no reliable way to count the number of hours used before they burn out. I've been fine for the past year, including a couple of accidental falls off a ladder with the lights on. I thought the filament was going to break, it landed and kept glowing. So I am satisfied with their work and will order them again if necessary.
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