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I unscrewed the pool light from the niche and found all this white solid crud inside. What is this and should I leave it there after replacing the bulb?

My 2004 Pentair SAM pool light died. I took the housing apart and would like to upgrade it to LED lights. Only issue is this model uses 2 MR16 bulbs and not the standard Edison type connectors. Also noticed there is an internal transformer sealed up in the light housing providing 12v power to...