These bulbs are small, but very bright, so they're often used in flashlights and optical instruments such as projectors and microscopes. Brightness is measured in lumens; the higher the lumens, the brighter the bulb.

Xenon bulbs are known for generating a bright light, such as a flash in a camera. They last longer than halogen and incandescent bulbs.

Incandescent bulbs are traditional light bulbs.