I've replace mine with a couple of different LEDs. I first tried a 19 led bulb from superbrightleds.com. It was a very faint light, and was only good for maybe a "mood" light. I was fairly disappointed.

I then bought this LED http://www.sailorssolutions.com/?page=ProductDetails&Item=SEN10W. And, you need to get the bayonet adapter here http://www.sailorssolutions.com/?page=ProductDetails&Item=SENBA. I am very impressed with the light output of this one. It is almost too bright, if thats possible. It's not a conventional looking led bulb, but it works. From what I've seen, this is the best out there.