Technique that emphasizes a particular object or draws attention to a
particular area. Accent Lighting usually utilizes a tight beam angle
PAR, MR or GU light source.
Alternating Current (AC):
Electrical current in which the flow of electric charge continually
Lighting designed to provide uniform light levels throughout an area.
The basic unit of electric current adopted under the System
International Unites. Typical Household circuit carries 15-50 amps.
Use of light source to illuminate from behind without protrusion through
The device that limits amount of current in an electrical circuit.
Size of the cone of light produced by lighting source measured in
The part of the bulb that is used to set it into place and to make
contact with electricity. There are many types and sizes. Most common
are E26/27. Which are the USA and European standard household Medium.
Screw in Base:
The 26 and 27 equates to the diameter measurement in millimeters of the
threads of a screw-in bulb base. This type of bulb includes the PAR 20,
PAR 30 and PAR 38 Type. There are MR16 and MR11 type Base as well as the
push and twist GU10.
Short for Canister Light. Another name for a recessed light or down
light which is a fixture installed into a hollow opening in a ceiling.
Unit of luminous intensity. Describing the intensity of a light source
in a specific direction.
Certifies product has met EU (European) consumer safety, health and or
environmental requirements. Compact Fluorescent which consume less
energy than Incandescent with the negative aspect of mercury/poison
Many LED's packaged together as a single lamp.
Color Temperature (CT):
This is a measurement of the Yellowness or Blueness of a White light
source based on a Kelvin number. Yellowish White described as Warm White
is compared to Incandescent Lamps which have a lower Kelvin temperature
number around 2700-3000 range. White and Bluish White described as
Natural White and Cold White have a higher Kelvin Temperature of
Kelvin color temperature of 5500-7000.
Color Rendering international system to rate lighting device ability to
render object colors. The higher the CRI (based on a 0-100 scale)
Natural outdoor light has a CRI of 100.
Optical element used to mix light ray to improve uniformity of light.
Dual In-Line Package
(aka straw hat).
A package (oval, rectangle) with two parallel connecting pins.
NB., Heat from the LED DIPs dissipates through the pins.
Direct Current (DC):
Electrical current which the flow of electric charge moves in one
Light source set in a metal cylinder. Mounted or recessed into the
ceiling so the beam of light is directed downward.
LED power supply providing either a constant level of current or a
constant level of voltage.
Edison Screw fitting system designated at standard screw-in bulb bases.
Also referred to a "Medium" or "Standard" Base.
A lamp that provides a broad beam intended to light a general area.
Light source consisting of a glass tube filled with low pressure mercury
vapor. Electrical discharge through the vapor produces ultraviolet light
that excites phosphor materials on the inside of the tube which emit
Sum of Lumens emitted by a light source.
A measure of illumination in which one unit equals the amount of light
delivered by a one-candela light source Foot Candle to a one square foot
surface one foot away.
A bipin base code. Each Pin has two diameters. Being larger near the
ends in order to twist and lock into position in the socket. GU10 Being
one of the most common base products almost always 110/120V AC.
This is the transition of thermal energy form a hotter object to a
cooler object. With LED heat sinks made from high quality aluminum and
other alloys accomplish this.
Generic term describing mercury vapor, metal halide, high pressure
sodium light sources and luminaries.
High Intensity Discharge
Electrical lamp filled with gases and other compounds in which an
electric arc is passed between tungsten electrodes to produce light.
High Pressure Sodium (HPS):
High Intensity discharge lamp offering a warm Correlated Color
Temperature (CCT) high levels of efficiency, long life with very modest
levels of CRI.
Light produced when a filament is heated to incandescence using electric
current. Incandescent lighting is very inefficient since most of the
energy is wasted as heat rather than light.
Unit of temperature starting from absolute zero.
Color measure as to Yellowness or Blueness of the color white. The
higher to Kelvin temperature the more Blue the White.
Measure of electrical power equal to 1000 Watts.
Light Emitting Diode solid state semiconductor device that converts
electrical energy directly into light.
The LED Life refers to the number hours an LED can be used before
needing to be replaced. Typically LED life reaches up 50,000 hours plus
for quality manufactured products.
The decrease of light output over time.
IESNA approved method for the electrical and photometric test of solid
state lighting devices. Specifies procedures for measuring total
luminous flux electrical power, luminous efficacy.
IESNA approved method of measuring Lumen depreciation of LED Light
sources. It is related
to the effective useful life of the product.
Specifically: "the elapsed operating time at which the specified
percentage of the lumen
depreciation or lumen maintenance is reached, expressed in hours."
Measurement of luminous flux of quantity of light emitted by a source.
Higher the Lumenthe Brighter the Light.
Describes how long a light source will retain a certain percentage of
its initial Lumen output.
Lighting fixture complete with lamp, housing, power supply and optical
components used to direct light.
Measurement of how effective the light source is in converting
electrical energy to Lumens of visible light. Usually expressed in
Lumens per watt (LPW).
Unit of luminance or density of light falling onto a surface. One lux is
equal to one lumen per square meter.
Metal Halide (MH):
High Intensity light source produced by the radiation from mercury, plus
halides of metals such as sodium, scandium, indium, and symposium.
A bipin base code for a 2 sharp pin push in base. Almost always 12V
Product. The MR16 LED lamps are a very popular replacement for Halogen.
Light with a Kelvin Temperature between 4500 and 5500.
NIT is a unit of luminous intensity equal to one candela - or standard
candle - per square meter.
Acronym for a Parabolic Reflector. PAR20, PAR30, PAR38 are the most
The distance from one pixel (LED or LED cluster) to an adjacent
pixel measured in millimeters.
A smaller pixel pitch will equal a higher resolution
Device that supplies electrical or energy. Most LED Power Supplies
Convert Line Voltage (110AC) to 12 & 24V DC.
Refers to upgrading a fixture, room, or building by installing new parts
Acronym for Red, Green, and Blue. These are the 3 primary colors of
light. Combinations of these 3 colors to create wide variety of other
Restricts the use of certain dangerous substances commonly used in
electrical and electronic equipment.
Surface mounted LEDs that are soldered to the surface of the circuit
board. The LED Die is integrated into the package design. Surface
Mounted LEDs can be assembled faster and with better quality than Dip
Solid State Lighting:
Refers to lighting technology that gives illumination when electricity
is passed through a semiconductor as opposed to a gas or vacuum tube. A
description of the devices that do not contain moving parts or parts
that can break, rupture, shatter, leak or contaminate the environment.
A lamp that produces a narrow beam angle designed to illuminate a
specific targeted area.
Controlling the operating temperature of the product through design.
Examples include heat sinks & air flow.
A ceiling recess like and inverted trough with its bottom next to the
ceiling. Used especially to enclose flourescent lamps and most recently
Term used to describe a fluorescent tube. Most typical sizes are T5, T8,
T10 and T12. T indicates the shape of the bulb is tubular. Typical
diameters T5 =5/8 " T8 =1" T12=1 1/2" Traditionally the T8, T10, and T12
use the dual pin G13 Socket.
Invisible radiation that is shorter in wavelength and higher in
frequency than visible violet light. UV rays are light waves that are
similar to the light from the sun. UV radiation can cause oxidation,
fading of colors of furniture, carpet, draperies and art work.
White color with a Kelvin temperature between 2800-3200.
The unit of electrical power as used by an electrical device during its
operation. Many lamps come with rating in watts to indicate their power
consumption. A light source with a higher lumen per watt value is more
Distance between two points of corresponding phase and is equal to
waveform velocity divided by frequency.