COLOR TEMPERATURE

The color temperature of a light source is taken from the temperature of a perfect black-body radiator that radiates light of a similar appearance to that of the light source. It is measured in units of absolute temperature; Kelvin (K). Similarly, although red is associated with being a hot color and blue a cold one, on the black body curve, blue occurs at higher temperatures than red. A more visual example of this apparent color temperature contradiction can be seen in candlelight, which emits a warm red orange glow, but in fact has a low Kelvin temperature of 1850K. Therefore higher color temperatures (5000K more) are called cool colors (bluish white); lower color temperatures (2700 – 3000K) are called warm colors (yellowish white to red).

Color Rendering Index (CRI)

The Color Rendering Index (CRI or Ra) is a quantitative measure, which rates a light source's ability to reproduce the colors of objects faithfully. In order to objectively compare the color rendering properties of any light source, the CIE's standardized measuring method operates on a scale from 0 to 100 (poor to excellent). The color change of 14 standard colors is calculated when an object is exposed to a specific light source and then this is compared to a reference illuminant of the same color temperature (a black body* is used for color temperatures up to 5000K and daylight above that). The CRI for a pair of light sources can only be compared if they have the same color temperature.

The CRI scale is chosen so that an ideal black body source, such as incandescent or halogen lamps, is by defining a CRI rating of 100. For light sources emitting a discrete spectrum, like LED and discharge lamps, the CRI can be anywhere between 0 - 100. As a rule of thumb, the more the spectrum is filled at all wavelengths (380 – 760nm), the better the color rendering properties of the source, however a high CRI measurement intrinsically means lower efficacy (as less efficient wavelengths are also represented in the spectrum).

* A black body is a theoretical object that absorbs all incident electromagnetic radiation and due to its ability to absorb at all wavelengths, is the best possible emitter of thermal radiation. It radiates a continuous spectrum that depends on the body's temperature.