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Difference between revisions of "Terminology"
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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 | ;<span id="mAh">mAh</span>: 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. | ||
;mcd: millicandela - a measurement of [[Light Output Measurements|light intensity]] | ;mcd: millicandela - a measurement of [[Light Output Measurements|light intensity]] | ||
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;<span id="throw">throw</span>: the ability of a flashlight to place light onto a distant defined area of surface, i.e how well the light is collimated. The throw of a light source of fixed power will be defined by the surface brightness of the light emitter, and the shape, diameter, depth, smoothness, and reflective efficiency of the reflector surface. A flashlight with good throw characteristics is called a "thrower" and generally has a narrow beam that is best for illuminating objects at a distance (hundreds of feet). Compare with [[#flood|flood]]. The [[ANSI-NEMA FL-1|ANSI/NEMA FL-1]] standard states throw two ways: candela and meters. | ;<span id="throw">throw</span>: the ability of a flashlight to place light onto a distant defined area of surface, i.e how well the light is collimated. The throw of a light source of fixed power will be defined by the surface brightness of the light emitter, and the shape, diameter, depth, smoothness, and reflective efficiency of the reflector surface. A flashlight with good throw characteristics is called a "thrower" and generally has a narrow beam that is best for illuminating objects at a distance (hundreds of feet). Compare with [[#flood|flood]]. The [[ANSI-NEMA FL-1|ANSI/NEMA FL-1]] standard states throw two ways: candela and meters. | ||
; | ;ti: Titanium - used to make flashlights that many consider attractive, rugged, and have good wear properties. More expensive and doesn't conduct heat as well as Aluminum. See [[Materials#Titanium|Titanium]] | ||
;TIR: total internal reflection. A glass or plastic "lens" that collimates light rays from the light emitter, both by reflecting them and by refracting them. Theoretically, ALL of the light produced by the emitter is gathered by the TIR optic. (See optic). | ;TIR: total internal reflection. A glass or plastic "lens" that collimates light rays from the light emitter, both by reflecting them and by refracting them. Theoretically, ALL of the light produced by the emitter is gathered by the TIR optic. (See optic). | ||
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;UCL: Ultra Clear Lens, a trademarked glass lens with anti-reflective coating sold by flashlightlens.com | ;UCL: Ultra Clear Lens, a trademarked glass lens with anti-reflective coating sold by flashlightlens.com | ||
;UI: user interface. The button presses, head twists, and whatever else is required to operate the flashlight, get to various modes, etc. | ;<span id="UI">UI</span>: user interface. The button presses, head twists, and whatever else is required to operate the flashlight, get to various modes, etc. | ||
;unprotected: see protected. | ;unprotected: see protected. | ||
;<span id="Vf">Vf</span>: Forward Voltage (a property of an [[LED]]). The voltage drop across a LED at a given current. | ;<span id="Vf">Vf</span>: Forward Voltage (a property of an [[LED]]). The voltage drop across a LED at a given current. | ||