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Difference between revisions of "Terminology"
A few additions - which might be better elsewhere.
(A few additions - which might be better elsewhere.) |
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;hotwire: Generally, a [[Maglite]] that has been modified with special bulbs and batteries to be significantly brighter | ;hotwire: Generally, a [[Maglite]] that has been modified with special bulbs and batteries to be significantly brighter | ||
;IMR: [[Rechargeable#Lithium_Manganese_.28LiMn.29_3.7V.2Fcell|Lithium-Manganese]] batteries sold by AW. | ;IMR: [[Rechargeable#Lithium_Manganese_.28LiMn.29_3.7V.2Fcell|Lithium-Manganese]] batteries sold by AW. Sony manufacture equivalent cells called Konion | ||
;incan: [[Incandescent]] | ;incan: [[Incandescent]] | ||
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;Li-Ion: Lithium-Ion rechargeable battery. See article [[rechargeable]]. | ;Li-Ion: Lithium-Ion rechargeable battery. See article [[rechargeable]]. | ||
;Lipo: Lithium polymer rechargeable battery. See article [[rechargeable]]. | |||
;LOP: Light Orange Peel - used to describe a type of texture on a reflector | ;LOP: Light Orange Peel - used to describe a type of texture on a reflector | ||
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;lux: a measurement of [[Light Output Measurements|light intensity]]. Lux refers to intensity of light at a spot (compare to lumens). | ;lux: a measurement of [[Light Output Measurements|light intensity]]. Lux refers to intensity of light at a spot (compare to lumens). | ||
;mAh: milliampere-hours - a rating of battery capacity in thousandths of an ampere in an hour. A 1000mAh battery should be able to discharge 1000mA for 1 hour or 500mA for 2 hours. Multiply this by the voltage to get watt-hours, which is the amount of power stored in the battery. | ;mAh: milliampere-hours - a rating of battery capacity in thousandths of an ampere in an hour. A 1000mAh battery should be able to discharge 1000mA for 1 hour or 500mA for 2 hours. Multiply this by the voltage to get watt-hours, which is the amount of power stored in the battery. Multiply watt-hours by 3600 to get the total energy storage in joules - to get the result in kilocalories (Food calories are kilocalories) divide the joule figure by 4184. | ||
;mcd: millicandela - a measurement of [[Light Output Measurements|light intensity]] | ;mcd: millicandela - a measurement of [[Light Output Measurements|light intensity]] | ||
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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. 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]]. | ||
;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]] | ||
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;preflash: when a light is turned on and emits a short burst of brighter light before settling down to the correct output level | ;preflash: when a light is turned on and emits a short burst of brighter light before settling down to the correct output level | ||
;protected: Preventing damaging [[Rechargeable#Lithium_Ion_.28Li-ion.29_-_3.7V.2Fcell|Li-Ion]] cells by excessive discharge, either by a protection circuit built into the battery, or (in some flashlights) by the light turning off or going to a lower level. | ;protected: Preventing damaging [[Rechargeable#Lithium_Ion_.28Li-ion.29_-_3.7V.2Fcell|Li-Ion]] cells by excessive discharge or current, either by a protection circuit built into the battery, or (in some flashlights) by the light turning off or going to a lower level. | ||
;<span id="PWM">PWM</span>: Pulse Width Modulation. A technique of varying the brightness of a LED by flashing it on and off very quickly, making it appear to the eye that the LED is dimmer. Good PWM is at such a high rate that you can't notice it. But if you wave your hand in front of the light and get a strobe effect, the PWM is getting too low. Some use current regulation which makes the light dimmer without PWM. | ;<span id="PWM">PWM</span>: Pulse Width Modulation. A technique of varying the brightness of a LED by flashing it on and off very quickly, making it appear to the eye that the LED is dimmer. Good PWM is at such a high rate that you can't notice it. But if you wave your hand in front of the light and get a strobe effect, the PWM is getting too low. Some use current regulation which makes the light dimmer without PWM. | ||