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

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

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

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

A sealing gasket keeps out oil and other contaminants.

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

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