Lantern for remote camping area

Im looking for sugguestions for the most efficent type lantern to use at a remote (battery
only) powered camper. I need something that will or can be wired for 12,6 volt or run on any combination of nicad/lion rechargables. It has standard 12v auto bulbs in it now but they are rough on a small battery that only gets charged from my ATVs system once a week or so.
Efficiency is what Im after, dont need alot of light & I think LEDs or Florescents may be my
best bet. I can wire up about any type of battery pack to the camper or light & it dont have to be portable either.

questions
how many people
how much space to be lighted
what activities are it needed for (reading, working on stuff etc)
what is your budget
would you want a fixed light or portable one
would multiple light levels be better

how many people [ just one ]
how much space to be lighted [28 x 8 camper - 20x6 open pourch w/metal roof]
what activities are it needed for (reading, working on stuff etc) [ minimal,mainly enough
to work alittle, less than enough to read by]
what is your budget [depends on how I like the lights & their power requirement]
would you want a fixed light or portable one [either, fixed would be ok]
would multiple light levels be better
[big question, yes right now there are 8 light fixtures thet have 2 or 3 - 12v 10w auto
type bulbs, like the ones used in taillights & the switch will select 1-2 or 3]

The main thing is to get better efficency than a incandesent, I dont need alot of light &
can wire it into the existing fixture or seperately. I only use wiring for lights so I can change
the 12v battery to just about any voltage. I dont use the camper but a few hours a night
and maybe several days a week at most, mainly just a place to get out of the weather
for awhile.

for one person you don't need a lot of light then... a single high power LED like luxeon 1 or about 40 lumens should suffice. Also a 4 watt fluorescent light would suffice well too which may be a lot easier and cheaper to come by. As for your 12v system they have 8 watt fluorescent lights for under $10 at places like walmart and lowes I think that use 8AAs or.. 12v. You could also even go somewhere that sells cold cathode kits for computers and get CCFL lights and make yourself a light too. they have white kits for about $10 online. Another option is a headlamp too. I enjoy using my headlamps as they don't have to have as much power when the light is already pointed right .