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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. | ||
;electronic switch: instead of running power through the switch, the electronic switch just tells the driver when to let power through. This setup allows for a more versatile interface by allowing double clicks, click and hold, etc. Also an electronic switch can work better in a high power light since the switch controls the driver instead of all of the current having to flow through the switch itself. Electronic switches also require a small amount of current even when turned off so the driver can monitor the switch. This is called parasitic drain and can eventually deplete the battery when not in use. | |||
;<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 article [[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 article [[Light Output Measurements]]. | ||
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;R9: When measuring [[#CRI|color rendering index]] of a light source, 8 different colors (R1-R8) are used, but none of those are pure red. R9 is red and therefore is a supplemental measurement to CRI that indicates how well a light source renders red. | |||
;<span id="ramping">ramping</span>: a mode in some flashlights where the brightness varies (ramps up or ramps down) and you select the brightness level you want. Sometimes this level is then memorized, but in the original [[NiteCore]] D10 it is only used until you turn the light off again. | ;<span id="ramping">ramping</span>: a mode in some flashlights where the brightness varies (ramps up or ramps down) and you select the brightness level you want. Sometimes this level is then memorized, but in the original [[NiteCore]] D10 it is only used until you turn the light off again. | ||