GreatLite Deep Waterproof Marine Lamp at Amazon.

Howdy DKTVN, and welcome to CPF,
I don't have any first hand knowledge, but here is a link to the company's product description page:
http://www.great-lite.com/marine-lamp-p-410.html

So, not an LED (it comes with an extra bulb). It's probably a Krypton bulb (possibly Xenon), and it uses 4 C cells. The magnetic switch is a nice touch for a truly waterproof design.
 
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