flashlights may consume 1 watt or much more

Posted by shiekh shazia on July 28th, 2016

flashlights may consume 1 watt or much more from the battery, producing heat as well as light. In contrast to tungsten filaments, which must be hot to produce light, both the light output and the life of an LED decrease with temperature. Heat dissipation for the LED often dictates that small high-power LED flashlights have aluminium or other high heat conductivity bodies, reflectors and other parts, to dissipate heat; they

http://www.dermayouth.org/which-tactical-flashlight-to-choose

can become warm during use.[11] Miniature LED flashlight on a key chain, powered by lithium primary coin batteries. Light output from LED flashlights varies even more widely than for incandescent lights. "Keychain" type lamps operating on button batteries, or lights using a single 5 mm LED, may only produce a couple of lumens. Even a small LED flashlight operating on an AA cell but equipped with 

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