We replaced all the G4 halogen bulbs in our interior lights with two of these..
G4 6-LED Side Pin Replacement
and three of these...
Red or White Switchable LED G4 Bulb
They all throw more light than the original halogens, much, MUCH less heat, and don't seem to have the nasty very directional qualities that a lot of folks complain about when it comes to LEDs. They are slightly, and I mean slightly, less "warm" than the halogens... a little whiter rather than amber/glowy... but nowhere near that obnoxious blue-white early LEDs had. Make sure you order the warm version, and not the cool. The switchable red/white bulbs are really neat; no need to add an extra switch. Switch it on, it's red; flick the switch off/on again, it turns white. Turn off for a few seconds, then back on.. it's red again. Not only is that great for preserving night vision, it's also a great way to amuse your dog and young children.
We also replaced the festoon steaming bulb and the MR16 bulb in our Hella combination deck/steaming light with the following..
MR16 LED Bulb
3W Power LED
Perko 42mm LED Festoon Bulb for Navigation Lights
I am really knocked out by the quality of these bulbs and the customer service of this company. All are very bright, throw off very little heat, and, although the total tab for all of these bulbs wasn't cheap, it was MUCH less than replacing all the fixtures. I only have one 80aH battery on our P26, and no charger other than the outboard. Our usage is minute other than lighting; anenometer, depthfinder, and radio. Now, our lighting draw is minimal, too. Instead of having lights but being hesitant to use them, we can use them freely. I just take the battery home once in a while and put it on a good smart charger for a day.
You could spend a lot more, and probably get better. You could spend a lot less and buy some poorly regulated knockoffs (or maybe something just as good... I was hesitant to take the chance). I think these bulbs are a great mix of quality and value.
On the other hand... as everyone probably already knows... what do I know?
Best to ya.