I use these (bought six years ago) in my Animal Plastics enclosures:https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 I only use dimmable, normal spectrum lights on animals, so these fit the bill. They have stood up to condensing conditions (rainbow boas), so should be fine regarding the water in a BP enclosure.
Low voltage DC lights are pretty safe inside enclosures. Extreme water contact could blow out the power supply. A safer fixture would have at least an IP64 water resistance rating (sealed against dust, and against splashed water). Many modern fish tank lights (newer Fluvals, Nicrews) are IP67 (one meter immersion), so if a person is very concerned about water safety that might be something to look into.
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