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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). See [[Light Output Measurements]]. | ;<span id="emitter">emitter</span>: 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." | ||