Instructables
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 2: Apply proper tools

Picture of apply proper tools
DSCF0439.JPG
In this case, it's just unscrewing the case, popping a clip off and not hurting yourself.

Step 3: Pop it open

Lookie what's inside, a 6v4.5 AH battery, 6v 25W H3 bulb, the switch by the trigger and a nice mirror.