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.

Offset pins on the base lock these bulbs into sockets. One pin is slightly higher on the base than the other pin.

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

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

Use these bulbs in ovens and equipment that reaches temperatures up to 500° F.

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

These bulbs lock into GU24 light sockets with a twist.

Trim around the bulb provides a finished look to recessed lights.

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

Replace metal halide, high-pressure sodium, and mercury vapor light bulbs with longer-lasting, energy-efficient LEDs.

Switch from the yellow light of high-pressure sodium to the white light of metal halide without changing ballasts.

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

Also known as beacon lights and signal lamps, these bulbs provide high-intensity light so they're often used in security warning devices and machinery.

Replace screw-in incandescent bulbs in exit signs with longer-lasting, energy-efficient LEDs.