These bulbs are small, but very bright, so they're often used in flashlights and optical instruments such as projectors and microscopes.

Offset pins on the base lock these bulbs into sockets. One pin is slightly higher on the base than the other pin.

Pins on either side of the base lock these bulbs into sockets.

Bulbs have two filaments, which operate at different brightness levels.

Use these bulbs in tight spaces, such as in indicators and vehicle lights.

Wire terminals allow you to connect these bulbs to a power source through a panel.