I saved some power in our boondocking camper by replacing turn signal bulbs with dimmer marker light bulbs. I also added a pair of LEDs in one fixture at reduced current to act as as always-on "night lights."
LEDs are the future, but the quality of what assemblies you can buy today is variable. There is no way to tell how well the individual LEDs in an assembly are powered, unless you wire them yourself. Price is no guarantee of quality at this point. Unless they are wired with voltage-independent current regulation, they will either:
1. waste power in heating up current-limiting series resistors
2. be efficient, but get dim fast as the battery discharges
3. be bright, but burn out on over-current when the battery is charged
I discussed this further on this thread: http://www.skoolie.net/forum/viewtop...p=43887#p43887