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Ed Hayes

Ron & Janet, I'm thinking its less about the moisture, and more about the lack of air circulation around the fixture/bulb. The one thing that reduces LED lifespan the most is heat. That's why many bulbs and fixtures have a heat sink to dissipate the heat efficiently, especially the higher wattage/lumen ones. Most "wet rated" fixtures are completely enclosed, which prevents airflow around the bulb, reducing it's ability to dissipate the heat. A fixture specifically designed for LEDs or one with LEDs built into it will likely last longer than placing an LED bulb in a standard wet-rated fixture, because they took the heat dissipation into account when designing the fixture. And in terms of lifespan, generally speaking, LEDs just reduce brightness as their lifespan reduces (mostly because of heat), so it's not like the will "burn out," their intensity will just reduce.

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dreamdoctor

Go to an electrical supply house and get their recommendation - then buy from them.

   
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David K Warfel at LightCanHelpYou.com

Ron & Janet, Ed has a good summary of issues. Water can, however, cause issues to the LED driver, which is like a transformer that converts electricity to the lower voltages required by LEDs. The bottom line is that nothing is as resilient as incandescent, but sealed, wet-rated, and outdoor-rated LEDs should be fine for a good long time. Look for fixtures that are serviceable from below the ceiling and, if you can, dim them. Dimming will reduce the heat on the LED and likely extend its life. How's that for a simple answer? Dreamdoctor's might be easier. :)

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