If you're referring to the steaming light, I'd save the money and not replace it with LED-- Every other light on the boat might get used when disconnected from a charging source, but the only time you'd use the steaming light is when the engine is running (and thus there's a charge coming from the alternator).
Having said that, it depends on what the boat was fitted with, and whether or not a previous owner replaced it. If memory serves, Hunter was using the Perko combination masthead light (link
here), which had two 'festoon' bulbs (Link
here).
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