WebTo change an underwater light bulb, here's the process: 1. Shut off power at the breaker, and also at any other switches. 2. It is not necessary to lower the water level. Most all light fixtures have enough cord coiled up inside of the light niche to allow the fixture to be brought up onto the coping stone for repair. WebCHANGING BULBS The most common repair job on underwater lights is relamping because of bulb failure. Most of the bulbs used in wet-niche type fixtures have a rated life of 800 to 1,000 hours. However, some of the more recent lighting fixtures have quartz-iodine bulbs, which have a rated life of 2,000 to 4,000 hours.
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