Anyone who has an older vehicle that is limited by it's 6v electrical system can now use more modern halogen lights by switching the bulbs. Where do you find them? In thrift stores, you just have to look.
Step 1: Gather materials
Here's the secret, a lot of spotlights that are burnt out still have good bulbs and sometimes batteries. Most die an early death because they are over, or improperly charged.
I managed to find this one for $3 with a nice burn mark on the handle, right by the plug.