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

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

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

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

Often used in task lights, these two-pin wedge base bulbs are comparable to PL, Dulux, and Biax bulbs.

Use these as replacement bulbs in stack lights.