Looking for Stern Light Light Replacement Bulb, What about LED replacement?

[Flyswatter]

What size do I need?  Like to have extra on the boat too. Where can I purchase?  What about LED replacement bulbs?  I've read that they draw ten times less power from the crank battery.  Are we talking Flash light size bulbs?

[Highlander]

Purchased a replacement at cabelas but if you pull the old bulb out and take it to an auto parts store like autozone they should be able to match it up even if the lettering has worn off the old bulb