25 Terms
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Lighting products
Industry: Lights & lighting
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Lighting products
chromaticity
Lights & lighting; Lighting products
Measure to identify the color of a light source, typically expressed as (x,y) coordinates on a chromaticity chart (See COLOR TEMPERATURE).
chromaticity coordinates
Lights & lighting; Lighting products
A system for measuring the color of the light emitted from a light source--either a primary source like a lamp or a secondary source like an illuminated object. Usually two numbers, x and y ...
coefficient of utilization (CU)
Lights & lighting; Lighting products
In general lighting calculations, the fraction of initial lamp lumens that reach the work plane. CU is a function of luminaire efficiency, room surface reflectances and room shape.
coil
Lights & lighting; Lighting products
Windings of copper or aluminum wire surrounding the steel core in ballast. Also refers to the entire assembly comprising the inductor or transformer.
color rendering index (CRI)
Lights & lighting; Lighting products
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 ...
color rendering indicator
Lights & lighting; Lighting products
Draws attention to the fact that this is a lamp with high color rendering, which helps objects and persons illuminated to appear more true to life.
color temperature (correlated color temperature - CCT)
Lights & lighting; Lighting products
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 ...
