Finally warm enough to get in the pool. Screw was stripped and the light had been plastered over, but with some leverage and a small chisel/crowbar I got the light out. This must be the original from when the pool was built decades ago, no?
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Opened it up. The existing gasket was gunky as all heck and was crumbling in my hands as I removed it.
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Bulb itself seemed okay. I wonder how old it is. Should I start to think about replacing this with an LED? While at the pool store this afternoon the owner told me incandescent pool bulbs are banned come this summer. Said they are no longer going to order any more and once the deadline hits they can't even sell their existing stock and will need to throw them out as it will be illegal. Do good LED screw in in replacements exist?
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This inside part under a little metal thing isn't looking to good. This is under a metal part that sits down there. I don know what this all is but half of it was cracked or melted or whatever. Pieces of it came out when I took everything apart.
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Clamps still look okay.
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So I went to the pool store and picked up a new gasket. I cleaned up the glass, put it on, reseated the metal clip thing, screwed back in the light and tested it quickly, I know you aren't supposed to turn it on until under the water but I wanted to see if it would keep tripping the breaker after it was sitting out for a bit and put back together. It all lit up, breaker didn't trip. Turned it right off, put it back together, cranked the screws down tight, and put it under the water. Light still works. Screwed it back into the wall with a new screw and tried it again, it's still working.
Will test it some more tonight when the sun goes down and leave it on for a while.