Lighting products

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.

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 ...