Daylight has a spectrum similar to that of a black body with a correlated color temperature of 6, 500 K ( D65 viewing standard ) or 5, 500 K ( daylight-balanced photographic film standard ).
22.
The inverse calculation, from chromaticity co-ordinates ( " x ", " y " ) on or near the Planckian locus to correlated color temperature, is discussed in Color temperature # Approximation.
23.
D . B . Judd, D . L . MacAdam, G . Wyszecki, Spectral distribution of typical daylight as a function of correlated color temperature, Journal of the Optical Society of America 54 ( 1964 ) 1031-1040.
24.
CIE 1960 UCS . The isotherms are perpendicular to the Planckian locus, and are drawn to indicate the maximum distance from the locus that the CIE considers the correlated color temperature to be meaningful : \ Delta uv = \ pm 0.05 ]]
25.
CIE 1960 UCS . The isotherms are perpendicular to the Planckian locus, and are drawn to indicate the maximum distance from the locus that the CIE considers the correlated color temperature to be meaningful : \ Delta _ { uv } = \ pm 0.05 ]]
26.
Judd " et al . " simply tabulated the values of certain chromaticity coordinates, corresponding to commonly used correlated color temperatures, such as 5500 K, 6500 K, and 7500 K . For other color temperatures, one could consult figures made by Kelly.
27.
The manufacturer of each selected luminaire will be required to commission third-party testing, each being tested for : total luminous flux, luminaire efficacy, correlated color temperature, color rendering index, steady state package / module / array temperature, and maximum power supply case.
28.
The illuminance of a source is the dominating factor for deciding as to whether or not a source is pleasing or comfortable, as viewers participating in this experiment evaluated a range of correlated color temperatures and illuminance levels, yet their impressions remained generally unchanged as correlated color temperature changed.
29.
The illuminance of a source is the dominating factor for deciding as to whether or not a source is pleasing or comfortable, as viewers participating in this experiment evaluated a range of correlated color temperatures and illuminance levels, yet their impressions remained generally unchanged as correlated color temperature changed.
30.
Judd, D . B ., MacAdam, D . L ., Wyszecki, G . W . Spectral distribution of typical daylight as a function of correlated color temperature, " Journal of the Optical Society of America ", 54, 1964, 1031 1036.
