【Lighting Knowledge】Correlated Color Temperature (CCT)
Jun 29, 2016

Correlated Color Temperature is usually expressed in Kelvin’s of a blackbody radiator that most closely resembles the color of a stimulus of equal brightness.

【Lighting Knowledge】Color Rendering Index (CRI)
Jun 29, 2016

Effect of an illuminant on the color appearance of objects by conscious or subconscious comparison with their color appearance under a reference illuminant.

【Lighting Knowledge】Color Quality Scale (CQS)
Jun 29, 2016

In order to meet the new needs in the Solid State lighting industry and consumers for communicating color quality of all lighting products, Color Quality Scale (CQS) is being developed at NIST, which evaluates several aspects of the color quality of objects illuminated by the light source.

【Lighting Knowledge】Illuminance
Jun 29, 2016

Illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception.

【Lighting Knowledge】Chromaticity Coordination
Jun 29, 2016

Color as described in the CIE1931 system can be plotted on a chromaticity diagram, usually a plot of the chromaticity coordinates x and y.

【Lighting Knowledge】Wavelength of Peak and Peak counts
Jun 29, 2016

Wavelength of peak, the wavelength at which the intensity of a light source is maximum. Peak count, the maximum counts in the spectral diagram.

【Lighting Knowledge】Dominant Wavelength (λd)
Jun 29, 2016

The dominant wavelength of a color is the wavelength of the spectrum color whose chromaticity is on the same straight line as the sample point and the illuminant point.

【Lighting Knowledge】Excitation Purity
Jun 29, 2016

Excitation purity is the distance from illuminant point to reference point, divided by that from illuminant point to spectrum locus. The ratio used as a guide of the wavelength of spectrum color needed to be mixed with a reference color to give the specified color.

【Lighting Knowledge】TLCI
Jun 29, 2016

European Broadcasting Union (EBU) presented new evaluation standard for studio lights and luminaires, Television Lighting Consistency Index (TLCI).

【Lighting Knowledge】GAI
Jun 29, 2016

Gamut area index (GAI) is a good indicator of color saturation. A light source with high GAI shows good color discrimination, saturation, and vividness. Choosing a source with high CRI (85 or greater) and a high GAI (80-100) is better. However, GAI higher than 100 might be saturated.