The stern light on my 36C is a Perko, it's rectangular and mounts to the transom right under the cockpit coaming. I've kept it that way because I was too lazy to fill in the large rectangular hole that Hatteras made for it (not needed, by the way; it could almost surface mount) So, since Perko still make the same light, I fitted a new one today.
The bulb that it takes is a single-wire festoon bulb. I decided to replace that with an eight-LED panel festoon bulb from Superbrightled. com. Not expensive, the price has gone down on these, I think it was about eight bucks. I did have to take the lamp housing apart and grind one of the bulb holders a bit, so the LED panel festoon bulb would fit in there. Works very well, much brighter than the old ones, which I've kept as a spare.
The last two are the anchor and white running light. I have the bulbs- I think- might tackle that tomorrow.
Even measuring and looking at the drawings on Superbrightled.com doesn't always ensure that the LED bulb will fit. They don't seem to come in standard dimensions and part numbers, like the old incandescent bulbs did, so it's kind of a crapshoot. But when I'm done, hopefully I've have converted all of them to LEDs, which require a lot less maintenance and are brighter in the bargain.
