You need a pool lamp, though I confess, I'm not sure what the difference is.
However, you can get either a 12V or a 130V 300W Pool/Spa rated bulb at Amazon for under $15:
Feit Electric 300R/FL-12 300-Watt R40 12-Volt Pool/Spa Flood Reflector
Feit Electric 300R/FL-130 300-Watt R40 130-Volt Pool/Spa Flood Reflector
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