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

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

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

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

Commonly used in signs, instruments, indicators, and flashlights.

These miniature bulbs are sized to fit older telephone switchboards, signs, instruments, and indicators.

Fit these bulbs in tight spaces such as signs, control panels, indicators, and flashlights.

Pins on the base lock these bulbs into sockets to withstand vibration. They're often used in machines and elevators.

Use these as replacement bulbs in stack lights.