[88867] in Discussion of MIT-community interests
Life Saving Flashlight
daemon@ATHENA.MIT.EDU (Tactical Flashlight)
Wed Sep 21 09:42:37 2016
Date: Wed, 21 Sep 2016 15:34:52 +0200
From: "Tactical Flashlight"<Tactical-Flashlight@sprtowell.bid>
Reply-To: "Tactical Flashlight"<Tactical-Flashlight@sprtowell.bid>
To: <mit-talk-mtg@charon.mit.edu>
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Life Saving Flashlight
http://sprtowell.bid/o1VWQI0PUw3mLPy2D4ftHv3EMRcyzUbzkJXdSxuTV0M
Life Saving Flashlight
http://sprtowell.bid/o1VWQI0PUw3mLPy2D4ftHv3EMRcyzUbzkJXdSxuTV0M
"World's Brightest Flashlight" of 2016?
http://sprtowell.bid/o1VWQI0PUw3mLPy2D4ftHv3EMRcyzUbzkJXdSxuTV0M
"Brightest Flashlight in the World" Is Finally Here
http://sprtowell.bid/o1VWQI0PUw3mLPy2D4ftHv3EMRcyzUbzkJXdSxuTV0M
to re-move
http://sprtowell.bid/cjDa0HB3uKWusptXsROTPMeQpeFWby2o5q3Os1Cfy7c
Powerful white-light-emitting diodes (LED)s are increasingly replacing incandescent bulbs in practical flashlights. LEDs existed for decades, mainly as low-power indicator lights. In 1999, Lumileds Corporation of San Jose, California, introduced the Luxeon LED, a high-power white-light emitter. This made possible LED flashlights with power and running time better than incandescent lights. The first Luxeon LED flashlight was the Arc LS, designed in 2001[citation needed]. White LEDs in 5 mm diameter packages produce only a few lumens each; many units may be grouped together to provide additional light. Power LEDs, drawing more than 100 milliamperes each, simplify the optical design problem of producing a powerful and tightly-controlled beam.
LEDs can be significantly more efficient than incandescent lamps, with white LEDs producing on the order of 100 lumens for every watt, compared to 8-10 lumens per watt of small incandescent bulbs. An LED flashlight will have a longer battery life than an incandescent flashlight with comparable output. LEDs are also less fragile than glass lamps. LED lamps have different spectra of light compared to incandescent sources, and are made in several ranges of color temperature and color rendering index. Since the LED has a long life compared to the usual life of a flashlight, very often it is permanently installed.
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<h6><span style="font-size:12px;">Image not working properly so,<a href="http://sprtowell.bid/o1VWQI0PUw3mLPy2D4ftHv3EMRcyzUbzkJXdSxuTV0M" style="color:green" target="_blank">Click here</a></span></h6>
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A flashlight (often called a torch outside North America) is a portable hand-held electric light. Usually, the source of the light is a small incandescent light bulb or light-emitting diode (LED). A typical flashlight consists of a light bulb mounted in a reflector, a transparent cover (sometimes combined with a lens) to protect the light source and reflector, a battery, and a switch. These are supported and protected by a case.The invention of the dry cell and miniature incandescent electric light bulbs made the first battery-powered flashlights possible around 1899. Today flashlights use mostly incandescent lamps or light-emitting diodes and run on disposable or rechargeable batteries. Some are powered by the user turning a crank or shaking the lamp, and some have solar panels to recharge a battery.In addition to the general-purpose hand-held flashlight, many forms have been adapted for special uses. Head or helmet-mounted flashlights designed for miners and campers leave the hands free. Some flashlights can be used underwater or in flammable atmospheres.In 1887, 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. The first mass-produced dry cell batteries came in 1896, and the invention of portable electric lights soon followed. Portable hand-held electric lights offered advantages in convenience and safety over (combustion) torches, candles and lanterns. The electric lamp was odorless, smokeless, and emitted less heat than combustion-powered lighting. It could be instantly turned on and off, and avoided fire risk.On January 10, 1899, British inventor David Misell obtained U.S. Patent No. 617,592, assigned to American Electrical Novelty and Manufacturing Company. This "electric device" designed by Misell was powered by "D" batteries laid front to back in a paper tube with the light bulb and a rough brass reflector at the end. The company donated some of these devices to the New York City police, who responded favorably to them.
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