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Emergency Flashlights | Emergency Strobe Lights

A flashlight or torch is a hand-held portable electric spotlight. It is known as a flashlight mainly in the United States and Canada and as a torch in most Commonwealth countries.

Emergency Flashlights

A typical emergency flashlight consists of a small electric lightbulb with associated parabolic reflector, powered by electric batteries, and with an electric power switch.

The components are mounted in a housing that contains the necessary electric circuit and provides ease of handling, a means of access to the batteries for replacement, and a clear covering over the lightbulb for its protection.

Although a relatively simple device, its invention did not occur until the late 19th century because it depended upon the earlier invention of the electric battery and incandescent light bulb. The batteries in the first ones were of such short useful life that the common method of operating them was to flash them just long enough to discern the environs, and only as needed; hence the term "flash-light". It is, however, reminiscent of the far-earlier "bullseye" lantern.

Always keep a stock of fresh batteries with your emergency flashlight.
 
Emergency Flashlights
Recently, emergency 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, CA introduced the Luxeon LED, a high-power white-light emitter. For the first time this made possible LED flashlights with power and running time better than some incandescent lights. The first Luxeon LED flashlight was the Arc LS in 2001.

LEDs can be significantly more efficient at lower power levels, hence use less battery energy than normal lightbulbs. Such flashlights have longer battery lifetimes, in some cases hundreds of hours. At higher power levels, the LED efficiency advantage diminishes. LEDs also survive sharp blows that often break conventional lightbulbs.

LED flashlights are often electronically regulated to maintain constant light output as the batteries fade. By contrast a non-regulated flashlight becomes progressively dimmer, sometimes spending much of the total running time below 50 percent brightness level.

A common misconception about LED-based flashlights is that they generate no heat. While lower-power LED flashlights generate little heat, more powerful LED lights do generate significant amounts of heat. However the heat removal mechanism is different for LED flashlights. An incandescent light radiates away a significant fraction of the bulb heat in the beam itself. You can feel the warm beam from a nearby powerful incandescent flashlight or spotlight. By contrast an LED flashlight radiates little heat in the beam, so the excess emitter heat must be removed by conduction and transferred to the flashlight body. For this reason higher-powered LED flashlights usually have metal bodies and can become warm during use.
Source: Wikipedia
 
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Emergency Flashlights | Emergency Strobe Lights