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Difference between revisions of "Terminology"
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;optic: usually a total-internal-reflection (see TIR) reflector/refractor, as opposed to a metal-coated reflector. See article [[Lenses]]. | ;optic: usually a total-internal-reflection (see TIR) reflector/refractor, as opposed to a metal-coated reflector. See article [[Lenses]]. | ||
;O-Ring: Usually placed in the assembly parts of the torch on the back and front. Helps to prevent dirt and dust to enter the torch. | |||
;<span id="OTF">OTF</span>: Out-the-front. The amount of light that is actually emitted out of the front of the light, usually measured in lumens. This number is always lower than lumens measured at the emitter (at the LED itself). Some manufacturers quote OTF lumens and others use emitter lumens. Usually the OTF value is around a third less than the rated output of the light-producing device. See [[Light Output Measurements]]. | ;<span id="OTF">OTF</span>: Out-the-front. The amount of light that is actually emitted out of the front of the light, usually measured in lumens. This number is always lower than lumens measured at the emitter (at the LED itself). Some manufacturers quote OTF lumens and others use emitter lumens. Usually the OTF value is around a third less than the rated output of the light-producing device. See [[Light Output Measurements]]. | ||