-A-
Accent LightingDirectional lighting to emphasize a particular object or draw attention to a display item.
Ambient LightingThe general lighting present in an area
--excluding task lighting and accent lighting but including general
lighting and daylight streaming in.
ANSI Ballast TypeBallast type used to operate lamp in accordance with ASNI standard.
ANSI CodesThese are 3-letter codes assigned by the American
National Standards Institute. They provide a system of assuring
mechanical and electrical interchangeability among similarly coded
lamps from various manufacturers. General Electric uses the assigned
ANSI Codes as Lamp Ordering Codes for most Projection Lamps.
ApplicationAlso called "lighting application," it refers to
the particular use the lamp is being put to. (e.g. high-bay industrial
application or retail lighting application.) The term can also refer in
a general way to "application engineering" which deals with specific
paramters and usage of light sources. (e.g. how to do a lighting
layout, where to place fixtures and so on.)
-B-
BallastAn auxiliary piece of equipment required to start and
to properly control the flow of current to gas discharge light sources
such as
fluorescent and
high intensity discharge (HID)
lamps. Typically, magnetic ballasts (also called electromagnetic
ballasts) contain copper windings on an iron core while electronic
ballasts are smaller and more efficient and contain electronic
components.
Ballast Efficacy Factor (BEF) Defined as ballast factor
divided by input watts. The value is used to evaluate various lighting
systems based on light output and power input. The BEF can only be used
to compare systems operating the same type and quantity of lamps.
Ballast LossesPower or energy dissipated in the ballast as heat and not converted to lamp energy.
BayonetA style of bulb base which uses keyways instead of
threads to connect the bulb to the fixture base. The bulb is locked in
place by pushing it down and turning it clockwise.
Beam AngleThe angular dimension of the cone of light from reflectorized lamps (such as R and
PAR
types) encompassing the central part of the beam out to the angle where
the intensity is 50% of maximum. The beam angle sometimes called "beam
spread" is often part of the ordering code for the reflectorized lamps.
Beam Spread (Approximate)For reflector type lamps. The total
angle of the directed beam (in degrees horizontal or vertical) to where
the intensity of the beam falls to 50% or 10% of the maximum
candlepower value as indicated.
Biax®GE trademark for its biaxial family of high-efficiency and long-life
compact fluorescent lamps. A straight tube is bent back in the middle, constituting a biaxial tube.
Bi-PinAny base with two metal pins for electrical contact.
This is the typical base for a fluorescent tube of 1 to 4 feet in
length. It consists of 2 prong contacts which connect into the fixture.
Medium bi-pins are used with type T-8 and T-12 tubular fluorescent
lamps, and miniature bi-pins are used for tubular T-5 fluorescent lamps.
Black LightA popular term referring to a light source emitting mostly near UV (320 to 400 nm) and very little visible light.
BulbA loose way of referring to a lamp. "Bulb" refers to the outer glass bulb containing the light source.
Bulb SizeBulb shape followed by its size (the maximum
diameter of the bulb expressed in eighths of an inch). For Compact
Fluorescent products, "S", "D", "T", and "Q" are used to represent
Single, Double, Triple and Quad Biax® sizes. The code also includes a
reference such as T4 to represent the size of the tube. Rectangular
headlamps are designated as "Rect" and the number of millimeters
horizontally.
BrightnessBrightness can refer to any of several technical terms used in lighting and is, therefore, ambiguous (See
LUMINANCE).
-C-
CandlepowerAn obsolete term for luminous intensity; current practice is to refer to this simply as candelas.
Compact Fluorescent Lamp (CFL)The general term applied to
fluorescent lamps
that are single-ended and that have smaller diameter tubes that are
bent to form a compact shape. Some CFLs have integral ballasts and
medium or candelabra screw bases for easy replacement of
incandescent lamps (See
SELF-BALLASTED LAMPS).
Center Beam Candlepower (CBCP)Refers to the luminous intensity at the center of the beam of a blown or pressed reflector lamp (such as a PAR lamp)
Color Rendering Index (CRI)An international system used to
rate a lamp's ability to render object colors. The higher the CRI
(based upon a 0-100 scale) the richer colors generally appear. CRI
ratings of various lamps may be compared, but a numerical comparison is
only valid if the lamps are close in color temperature. CRI differences
among lamps are not usually significant (visible to the eye) unless the
difference is more than 3-5 points.
Color Temperature (Correlated Color Temperature - CCT)A
number indicating the degree of "yellowness" or "blueness" of a white
light source. Measured in kelvins, CCT represents the temperature an
incandescent object (like a filament) must reach to mimic the color of
the lamp. Yellowish-white ("warm") sources, like
incandescent lamps,
have lower color temperatures in the 2700K-3000K range; white and
bluish-white ("cool") sources, such as cool white (4100K) and natural
daylight (6000K), have higher color temperatures. The higher the color
temperature the whiter, or bluer, the light will be
Compact Fluorescent Lamp (CFL)The general term applied to
fluorescent lamps that are single-ended and that have smaller diameter
tubes that are bent to form a compact shape. Some CFLs have integral
ballasts and medium or candelabra screw bases for easy replacement of
incandescent lamps.
Constant ColorA GE Registered name for lamp families which
show very little color shift over life. Generally applies to GE's
PRECISE MR-16 and GE's CMH (Ceramic Metal Halide) lamps.
Cool WhiteA term loosely used to denote a color temperature
of around 4100 K. The Cool White (CW) designation is used specifically
for T12 and other fluorescent lamps using halophosphors and having a
CRI of 62.
-D-
Daylight LampA lamp resembling the color of daylight, typically with a color temperature of 5500 K to 6500K
Dichroic Reflector (or Filter)A reflector (or filter) that
reflects one region of the spectrum while allowing the other region(s)
to pass through. A reflector lamp with a dichroic reflector will have a
"cool beam" i.e. most of the heat has been removed from the beam by
allowing it to pass through the reflector while the light has been
reflected.
DimmableWhether or not the lamp lumens can be varied while maintaining reliability.
Distance Between LegsFor U-shaped Fluorescent lamps, this measurement is the average distance between the inner walls of the legs.
Distance Between Leg CentersFor U-shaped Fluorescent lamps, this measurement is the average distance between the centers of each leg.
Distance Outside LegsFor U-shaped Fluorescent lamps, this measurement is the average distance to the outside of each leg.
-E-
EfficiencyThe efficiency of a light source is simply the
fraction of electrical energy converted to light, i.e. watts of visible
light produced for each watt of electrical power with no concern about
the wavelength where the energy is being radiated. For example, a 100
watt incandescent lamp converts 7% of the electrical energy into light;
discharge lamps convert 25% to 40% into light.
Electromagnetic Ballast (Magnetic Ballast)A ballast used with discharge lamps that consists primarily of transformer-like copper windings on a steel or iron core.
Electronic BallastA short name for a fluorescent high
frequency electronic ballast. Electronic ballasts use solid state
electronic components and typically operate fluorescent lamps at
frequencies in the range of 25-35 kHz. The benefits are: increased lamp
efficacy,
reduced ballast losses and lighter, smaller ballasts compared to
electromagnetic ballasts. Electronic ballasts may also be used with HID (high intensity discharge) lamps
-F-
FloodlightA luminaire used to light a scene or object to a
level much brighter than its surroundings. Usually floodlights can be
aimed at the object or area of interest.
Fluorescent LampA high efficiency lamp utilizing an electric
discharge through inert gas and low pressure mercury vapor to produce
ultraviolet (UV) energy. The UV excites phosphor
materials applied as a thin layer on the inside of a glass tube which
makes up the structure of the lamp. The phosphors transform the UV to
visible light.
Four-Pin Compact Fluorescent LampsA "plug-in" compact fluorescent lamp with 4 pins in the base to make electrical contact with the ballast.
Full Spectrum LightingA marketing term, typically associated
with light sources that are similar to some forms of natural daylight
(5000K and above, 90+ CRI), but sometimes more broadly used for lamps
that have a smooth and continuous color spectrum.
-H-
Halogen LampA halogen lamp is an incandescent lamp
with a filament that is surrounded by halogen gases, such as iodine or
bromine. Halogen gases allow the filaments to be operated at higher
temperatures and higher efficacies. The halogen participates in a tungsten transport cycle, returning tungsten to the filament and prolonging lamp life.
Halogen-IR (HIR) LampGE designation for high-efficiency
tungsten halogen lamps. HIR lamps utilize shaped filament tubes coated
with numerous layers of materials that transmit light but reflect the
heat (infrared) back into the filament. This reduces the power needed
to keep the filament hot.
High-Bay LightingLighting designed for (typically) industrial locations with a ceiling height of 25 feet and above.
High Intensity Discharge (HID) LampA general term for
mercury, metal halide (GE ConstantColor® CMH, Multi-Vapor, MXR or
Arcstream) and high-pressure sodium (GE Lucalox) lamps. HID lamps
contain compact arc tubes which enclose mercury and various gases with
other chemicals and operate at relatively high pressures and
temperatures.
High-Pressure Sodium (HPS) LampHPS lamps are high intensity
discharge light sources that product light by an electrical discharge
though sodium vapor operating at relatively high pressures and
temperatures. GE markets these lamps under the trade name of Lucalox.
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