possible hijack alert.

for headlamps, the above are all good recommendations.

for the situation you describe, go here:

http://www.gardeners.com/Dyno-Lites/20683,35-399,default,cp.html

it's small, keep stored / charged in your car's cigar lighter, and it's magnetic along the one side so it attaches most places on a car, and it's now on sale!

i paid the higher price and gave them for stocking stuffers. everyone i gave them to uses them.