Flashlight Power sources

The most common power source for flashlights is the battery. Many types of batteries are suitable for use in flashlights, such as button cells, alkaline batteries, lithium batteries and rechargeable NiMH and lithium ion batteries. The choice of batteries will depend on the light source used, and will usually play a determining role in the form factor of the flashlight. Continue reading “Flashlight Power sources”

LED Flashlight.

Recently, flashlights which use light-emitting diodes (LEDs) instead of conventional lightbulbs have become available.

LEDs have existed for decades, mainly as low-power indicator lights. In 1999, Lumileds Corporation of San Jose, California United States, introduced the Luxeon LED, a high-power white-light emitter. Continue reading “LED Flashlight.”

Incandescent Flashlight.

Incandescent flashlights use incandescent bulbs containing a electrical filament of tungsten wire, which gives off light energy as well as heat. The bulbs are evacuated with an inert gas (usually argon, sometimes with traces of halogen: in higher quality models, xenon is used). A popular example of an incandescent flashlight is the Maglite by Mag Instrument which are capable of producing 40 to 50 lumens. Continue reading “Incandescent Flashlight.”

What is Flashlight?

A flashlight (called a torch outside North America) is a portable electric spotlight that emits light from a small incandescent lightbulb or from one or more light-emitting diodes (LEDs). Typical flashlight designs usually consist of the light source in a parabolic reflector or specially shaped lens to shape the flashlight beam, a transparent window to protect the light source from damage and debris, a power source (typically electric batteries), and an electric power switch. Continue reading “What is Flashlight?”