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.

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

These bulbs produce a narrower, more concentrated beam of light than floodlight bulbs. Beam angles range from 10° to 24°.