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K.
Kilowatt
One thousand watts.
Kilowatt Hour
A unit of work or energy equal to that done by one kilowatt acting
for one hour; -- approx. = 1.34 horse-power hour. |
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L.
Lamp
An artificial source of light (also a portable luminaire equipped
with a cord and plug). Industry term for light bulb.
Light
Radiant energy that is capable of producing a visual sensation.
Lumens
The amount of light that a lamp produces or emits
Lumens per watt
A measurement of white light produced by each output watt.
Luminaire
A light fixture.
Luminance
The measured amount of light reflected by a surface.
Lux (lx)
A unit of illuminance equal to 1 lumen per square meter. |
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M.
Metal Halide Lamp
These HID bulbs produce a blue-white type light, these bulbs
are very efficient, and long lasting, average life span 20,000
hours. |
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P.
Power Factor
A measure of the effectiveness with which an electrical device
converts volt-amperes to watts; devices with power factors >0.90
are "high power factor" devices. |
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R.
Reflector
A metal or glass apparatus, usually curved in some manner, used
in most luminaires for the purpose of directing light rays froma
light source. In the film and video industries, a metallic or
reflective fabric panel, used for bounce lighting, or simply
to redirect light, with the light source being a luminaire or
sunlight. They are available in a variety of sizes and shapes,
and materials of varying reflectance. |
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S. |
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T.
Total Harmonic Distortion (THD)
A measure of the distortion of the current on alternating current
(AC) power systems caused by higher order harmonics of the fundamental
frequency (60Hz in North America). THD is expressed in percent
and may refer to individual electrical loads (such
as ballast) or a total electrical circuit or system in a building.
ANSI C82.77 recommends THD not exceed 32% for individual commercial
electronic ballasts, although some electrical utilities may
require lower THDs on some systems can cause efficiency losses
as well as overheating and deterioration of system components. |
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U. |
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V.
Voltage:
The electric potential which exists between two components in
an electrical system. Lamps are rated in terms of wattage at
a
specific voltage. Operating a lamp at another voltage from that
which it is rated may cause the lamp to burn at less than full
intensity or to burn out very quickly. |
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W.
Watt
A unit of electrical power equal to 1 joule per second. |
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