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”
A headlamp is a flashlight worn on the head.
Sometimes a light is mounted to a handgun or rifle. See also Streamlight and SureFire.
Most flashlights are cylindrical in design, with the lamp assembly attached to one end. However, early designs came in a variety of shapes. Continue reading “Other designs Flashlight.”
Another less common type of flashlight uses a High Intensity Discharge (HID) lamp as the light source. HID lamps work by discharging an electric current between two electrodes in a capsule filled with a mixture of metal halide salts and argon, producing an extremely bright light. Continue reading “HID 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 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.”
In 1896, the first dry cell battery was invented. Unlike previous batteries, it used a paste electrolyte instead of a liquid. This was the first battery suitable for portable electrical devices, as it did not spill or break easily and worked in any orientation. Continue reading “The History of 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?”