running time is limited by the relative

Posted by shiekh shazia on July 28th, 2016

running time is limited by the relative bulk of capacitors compared to electrochemical batteries. A reflector with an approximately parabolic shape concentrates the light emitted by the bulb into a directed beam. Some flashlights allow the user to adjust the relative position of the lamp and reflector, giving a variable-focus effect from a wide floodlight to a narrow beam. Reflectors may be made of polished metal,

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or glass or plastic with an aluminized reflective finish. Some manufacturers use a pebbled or "orange peel", instead of a smooth, reflector, to improve the uniformity of the light beam emitted. Where multiple LEDs are used, each one may be put in its own parabolic reflector. Flashlights using a "total internal reflection" assembly have a transparent optical element (light pipe) to guide light from the source

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