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Difference between revisions of "Terminology"
Tweaked some bookmark directors and a few minor spelling errors.
(Super tweaked the terminology page by creating bookmark anchors for all entries, this will make it easier to refer to the term from other pages.) |
(Tweaked some bookmark directors and a few minor spelling errors.) |
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;<span id="DD">DD</span>: 1. direct drive. See article [[Driver]]. | ;<span id="DD">DD</span>: 1. direct drive. See article [[Driver#Direct Drive|Direct Drive]]. | ||
:2. Dino Direct, a budget dealer | :2. Dino Direct, a budget dealer | ||
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:2. a translucent attachment to make a flashlight serve as a camping lantern. | :2. a translucent attachment to make a flashlight serve as a camping lantern. | ||
;<span id="direct drive">direct drive</span>: When the batteries power the LED directly without any regulation in the driver, or without a driver at all. See article [[Driver]]. | ;<span id="direct drive">direct drive</span>: When the batteries power the LED directly without any regulation in the driver, or without a driver at all. See article [[Driver#Direct Drive|Direct Drive]]. | ||
;<span id="DMM">DMM</span>: Digital | ;<span id="DMM">DMM</span>: Digital Multimeter. Measures volts, amps, ohms, etc. You can spend anywhere from a few dollars to several hundred on a DMM. For flashlights it is helpful to be able to measure current (amps) in addition to volts. | ||
;<span id="donut hole">donut hole</span>: a dark spot in the center of the flashlight beam. This is a common problem with multi-die emitters (can also appear as a plus-sign in the beam reflecting the layout of the 4 dice) but can also be the result of a poorly matched reflector. | ;<span id="donut hole">donut hole</span>: '''(or <span id="doughnut hole">doughnut hole</span>)''' a dark spot in the center of the flashlight beam. This is a common problem with multi-die emitters (can also appear as a plus-sign in the beam reflecting the layout of the 4 dice) but can also be the result of a poorly matched reflector. | ||
;<span id="driver">driver</span>: the electronics in between the battery and LED. This usually consists of a circuit board in the "pill". It regulates the voltage to the LED as well as provides the various modes and memory of the light. See article [[Driver]]. | ;<span id="driver">driver</span>: the electronics in between the battery and LED. This usually consists of a circuit board in the "pill". It regulates the voltage to the LED as well as provides the various modes and memory of the light. See article [[Driver]]. | ||
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;<span id="FET">FET</span>: field effect transistor. Basically a digitally controlled switch, these are used in high current [[driver|drivers]] offering less resistance to current than other designs and therefore higher output. | ;<span id="FET">FET</span>: field effect transistor. Basically a digitally controlled switch, these are used in high current [[driver|drivers]] offering less resistance to current than other designs and therefore higher output. | ||
; | ;<span id="flood">flood</span>: 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|throw]]. | ||
;<span id="flux">flux</span>: light output, measured in lumens. | ;<span id="flux">flux</span>: light output, measured in lumens. | ||
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;<span id="forward">forward clicky</span>: a switch that turns the light on with the button partially depressed and then locks into on once it is fully depressed and clicked. This allows "momentary on" by halfway depressing the switch and then releasing to turn it off. A forward clicky is not as good for switching modes. Compare with [[#reverse|reverse clicky]]. | ;<span id="forward">forward clicky</span>: a switch that turns the light on with the button partially depressed and then locks into on once it is fully depressed and clicked. This allows "momentary on" by halfway depressing the switch and then releasing to turn it off. A forward clicky is not as good for switching modes. Compare with [[#reverse|reverse clicky]]. | ||
;<span id="Forward Voltage">Forward Voltage</span> (a property of an [[LED]]). The voltage drop across a LED at a given current. If two LEDs are identical except one has a lower Vf, the one with the lower Vf will draw a higher current from a battery and will also be brighter. | ;<span id="Forward Voltage">Forward Voltage</span>: (a property of an [[LED]]). The voltage drop across a LED at a given current. If two LEDs are identical except one has a lower Vf, the one with the lower Vf will draw a higher current from a battery and will also be brighter. | ||
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;<span id="mAh">mAh</span>: milliampere | ;<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. | ||
;<span id="mcd">mcd</span>: millicandela, 1/1000 of a candela (cd) - a measurement of [[Light Output Measurements|light intensity]]. | ;<span id="mcd">mcd</span>: millicandela, 1/1000 of a candela (cd) - a measurement of [[Light Output Measurements|light intensity]]. | ||
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;<span id="spill">spill</span>: the area of a flashlight beam outside of the hotspot and corona. Light intensity in the spill area is typically low and even, and comes directly from the light emitting surface with little or no contribution from the reflector. | ;<span id="spill">spill</span>: the area of a flashlight beam outside of the hotspot and corona. Light intensity in the spill area is typically low and even, and comes directly from the light emitting surface with little or no contribution from the reflector. | ||
;<span id="spot">spot</span>: see hotspot | ;<span id="spot">spot</span>: see [[hotspot]] | ||
;<span id="spring bypass">spring bypass</span>: a modification to the battery springs in a flashlight to reduce resistance and increase current. The typical spring bypass involves soldering braided copper wire from the tip of the spring to the base where the spring attaches to the switch and/or driver. | ;<span id="spring bypass">spring bypass</span>: a modification to the battery springs in a flashlight to reduce resistance and increase current. The typical spring bypass involves soldering braided copper wire from the tip of the spring to the base where the spring attaches to the switch and/or driver. | ||