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Difference between revisions of "Terminology"
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;efficacy: the amount of light output divided by the power consumption. Usually measured in lumens per watt (a watt being volts times amps). For an LED, this value varies with power consumption, becoming less efficient as power increases. Although efficacy is a measure of how efficient an LED is, true "efficiency" would be a percentage calculated by dividing the light output energy divided by the energy consumed. | ;efficacy: the amount of light output divided by the power consumption. Usually measured in lumens per watt (a watt being volts times amps). For an LED, this value varies with power consumption, becoming less efficient as power increases. Although efficacy is a measure of how efficient an LED is, true "efficiency" would be a percentage calculated by dividing the light output energy divided by the energy consumed. | ||
;emitter: the actual light-emitting part of an LED assembly. e.g. a Luxeon star comprises a Luxeon emitter mounted to a star circuit board. Also can be used to describe where lumens are measured, for instance whether lumen output is measured at the emitter or OTF (out the front). | ;emitter: the actual light-emitting part of an LED assembly. e.g. a Luxeon star comprises a Luxeon emitter mounted to a star circuit board. Also can be used to describe where lumens are measured, for instance whether lumen output is measured at the emitter or OTF (out the front). See [[Light Output Measurements]]. | ||
;flood: scattered light emitted from a flashlight. Good for indoor use to light up a room or short-range use outdoors to light up an area. Compare with "throw." | ;flood: scattered light emitted from a flashlight. Good for indoor use to light up a room or short-range use outdoors to light up an area. Compare with "throw." | ||
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;LSD: Low Self-Discharge - a type of NiMh cell that keeps its charge longer than regular NiMh cells. See article [[rechargeable]]. | ;LSD: Low Self-Discharge - a type of NiMh cell that keeps its charge longer than regular NiMh cells. See article [[rechargeable]]. | ||
;lumens: (abbrev: lm) a measurement of [[Light Output Measurements|light output]]. Lumens measure all of the light output (compare to lux) | ;lumens: (abbrev: lm) a measurement of [[Light Output Measurements|light output]]. Lumens measure all of the light output (compare to lux). | ||
;Lux: short for Luxeon [[LED]], an early high-power LED (also LuxI, LuxIII, Lux3, LuxV for different versions of this LED) | ;Lux: short for Luxeon [[LED]], an early high-power LED (also LuxI, LuxIII, Lux3, LuxV for different versions of this LED) | ||
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;optic: usually a total-internal-reflection (see TIR) reflector/refractor, as opposed to a metal-coated reflector. | ;optic: usually a total-internal-reflection (see TIR) reflector/refractor, as opposed to a metal-coated reflector. | ||
;<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. | ;<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. See [[Light Output Measurements]]. | ||
;P60 drop-in: an assembly of the reflector, bulb, and driver originally introduced by [[SureFire]], but now an industry standard. See article [[Flashlight Types#P60|P60]] | ;P60 drop-in: an assembly of the reflector, bulb, and driver originally introduced by [[SureFire]], but now an industry standard. See article [[Flashlight Types#P60|P60]] | ||