Color rendering capacity is a measure of
how well colors are represented under artificial light. It is one of several
measures of color rendering index, indicating the extent to which a wide range of
colors may be distinguished under a given light source.
Technical definition
Associated with each type of spectral power
distribution, one and only one color solid can be constructed in a uniform
color space. It has been proved that
this color solid comprises all the object colors producible under illumination
of that spectral power distribution with one unit luminous flux, and the volume of the color solid determines
the upper limit for the number of the object colors producible under the given
spectral power distribution with one unit luminous flux. This volume of the color solid associated with
the spectral power distribution is called the color rendering capacity. It may be expressed as a proportion of the
volume of the color solid associated with the equal energy spectrum, and is
output in this form from computer software known as "CRC99".
Sample values
The color rendering capacity is 0.35 for
high-pressure sodium lamps, 0.97 for "Deluxe" fluorescent lamps, and
1.00 for equal energy spectrum respectively. These results conform with
everyday experience: high pressure sodium lamps are rarely used in stores for
commodity lighting, as the commodities would appear in monotonous yellow shades
while the same commodities under deluxe fluorescent, at the same light level,
display a much wider variety of colors. The color solid and the color rendering
capacity calculated for the spectrum of the Deluxe fluorescent lamp F7 is shown
on the picture.
Source From Wikipedia
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