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

These bulbs are sized to fit tight spaces such as indicators and vehicle lights.

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.

Often used as status indicators, in displays, or to check circuit function in prototyping and testing, these bulbs have wire terminals to directly install onto circuit boards.

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

Use these bulbs in standard sockets, panels, and appliances.

Pins on the base lock these bulbs into sockets to withstand vibration.