GLOSSARY

A
Accent Lighting
Directional lighting to emphasize a particular object or draw attention to a display item. We offer dual angle accent ligthing here and here, puck accent lighting here, right angle accent lighting here and here, and swivel angle accent lighting here and here.
Active Cooling
A cooling process that uses power for cooling components such as fans to actively exhaust heat from components.
Amp
The unit of measuring the rate of flow of electrical current: Current (Amps) = Power (Watts) / Voltage (Volts).
ASHRAE
American Society of Heating, Refrigerating and Air-Conditioning Engineers.
B
Binning
The grouping of LEDs (from production) according to specifications, such as light output, color, and voltage so that LEDs of similar light performance are grouped.
C
Color Definition
The color of uniformly illuminated objects described using three terms:
Hue: Describes the situation when the appearance of different colors is similar.
Lightness: Describes a range of grayness between black and white.
Chroma: Describes the degree of departure from gray of the same lightness and increasing color (e.g. red and redder).
Color rendering
For a light source, the extent of the agreement between the perceived color of a surface illuminated by the source and that of the same surface illuminated by a reference source under specified viewing conditions, measured and expressed in terms of the chromaticity coordinates of the source and the luminance of the source in agreed spectral bands.
Colour Rendering Index
Colour rendering index (CRI) is the term used to rate the ability of a light source to successfully illuminate an object to the levels of natural light as possible. The higher the CRI value the more accurate the lighting replication.
A CRI of 100 would mean the light is identical to standard daylight. Therefore most lighting sources are less than 100, such as LEDs which typically sit at, or greater than 80 on the colour rendering index.
Color temperature
The measurement of color expressed in Kelvin (K). The lower the Kelvin rating, the “warmer” or more yellow the light. The higher the rating, the “cooler” or more blue the light.
Cool (Cold) White
Bright light that is slightly blue in color, generally greater than 4,500K.
E
Efficiency
A general term for the amount of useful work per quantity of energy. See driver efficiency, fixture efficiency, LED efficiency, optical efficiency, and source efficiency.
F
Foot-Candle
A measure of illuminance or light intensity. A foot-candle reflects the amount of illumination the inside surface of a 1-foot radius sphere receives from a point source of one candela in the center of the sphere. A foot-candle is also equal to one lumen per square foot.
G
Glare
The sensation produced by brightness within the visual field that is sufficiently greater than the luminance to which the eyes are adapted. Glare can cause blurred vision, discomfort, headaches or loss in visual performance and visibility.
H
High Power LEDs
LEDs designed to operate at several hundred milliamps and a watt or more of power. Since these devices create substantial heat, which would destroy the unit if special steps were not taken, specialized heat dissipation technologies must be employed.
High Pressure Sodium (HPS)
A popular type of high intensity discharge (HID) lamp offering a relatively warm correlated color temperature (CCT), high levels of efficiency, and long life, but only modest levels of color rendering index (CRI).
I
Illuminance
The density of luminous power, also called “illumination.” One lumen of luminous flux uniformly incident on 1 square foot of area produces an illuminance of 1 footcandle. In SI units, one lumen of luminous flux uniformly incident on 1 square meter of area produces an illuminance of 1 lux.
Ingress Protection rating (IP Rating)
The IP code or IP rating defined in the international standard IEC 60529 that classifies the level of protection that electrical appliances provide against the intrusion of solid objects or dust, accidental contact, and water. Using the guide below, IP20 would mean a lighting unit has a solid rating of 2 (>12.5mm protection) and a liquid rating of 0 (no protection).
L
Lumen (lm)
Unit of measurement for the total amount of visible light emitted from a source, essentially a measure of brightness. The higher the lumen, the brighter the light.
Luminance
The luminous intensity of any surface in a given direction per unit of projected area of the surface viewed from that direction.
Luminous efficacy
The ratio of the total emitted luminous flux, in lumens, to the total electric power consumption in watts.
Luminous flux
The rate of flow of light per unit of time, especially the flux of visible light, expressed in lumens.
Luminous intensity
The luminous flux density per solid angle as measured in a given direction relative to the emitting source. The customary unit is candlepower, the SI unit is the candela.
W
Warm White
Traditionally yellow color light similar to conventional bulbs, generally around 2,700K-3,500K.
Watt
Unit of measurement for the rate of energy conversion or transfer: Power (Watts) = Current (Amps) X Voltage (Volts).