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.

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

Extend light into hard-to-reach spaces by attaching a fiber-optic cable to your flashlight.

Similar to a holster without the bulk, belt loops hold your flashlight when not in use.

Turn a mini flashlight into a headlamp with these straps.

A series of four flashes per cycle makes these lights more visible than other strobe lights.

Set these portable lights wherever you need a signal light—they don't need to be wired or plugged in.