Lighting for Car Living
The easiest way to light your vehicle at night is to use a headlamp. I recommend an LED lamp, as these have a much longer battery life. Such lamps can be found in outfitter stores, on the campmor website, and in the camping section of the mega-Marts.
These lamps draw very little power, put out a good deal of light, and leave your hands free. They are ideal for reading or any other in-vehicle tasks for homeless (car living) folks.
Final note-- I use re-chargeable batteries in my lamp.... I have a battery re-charger that plugs into any 110 outlet.