It would depend on the type of bulb you want to use. Incandescent, Halogen or LED.
I'd suggest LED. You will need to identify the manufacturer of the light used on your boat to identify the bulb.
Companies like AquaSignal, Perko are common.
MarineBeam has replacement bulbs that will give you good service. (https://store.marinebeam.com for bulbs or https://store.marinebeam.com/led-masthead-foredeck-combination-light/ for a sealed steaming light.)
You may also find an answer searching the SBO store here on this website.
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