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.
42.
This characteristic mainly reflects itself in a low Gaussian spectral distribution, the value of L c is inversely proportional to the spectral width, BW, so that the full width at half maximum ( FWHM ) of the power spectral density can be related to L c through the equation
43.
Assuming a high temperature heat bath with the Drude spectral distribution J ( \ omega ) = \ hbar \ eta \ gamma ^ 2 \ omega / \ pi ( \ gamma ^ 2 + \ omega ^ 2 ) and taking the time derivative of the path integral form density matrix the equation and writing it in hierarchal form yields
44.
According to historian D . M . Siegel : " He was not a practitioner of the more sophisticated techniques of nineteenth-century mathematical physics; he did not even make use of the functional notation in dealing with spectral distributions . " He made no mention of thermodynamics in this paper, though he did refer to conservation of " vis viva ".
45.
In XYZ space, all combinations of nonnegative coordinates are meaningful, but many such as the primary locations [ 1, 0, 0 ], [ 0, 1, 0 ], and [ 0, 0, 1 ] correspond to imaginary colors outside the space of possible LMS coordinates; imaginary colors do not correspond to any spectral distribution of wavelengths, so have no physical reality.
46.
IEC standard 61215 is used to compare the performance of cells and is designed around standard ( terrestrial, temperate ) temperature and conditions ( STC ) : irradiance of 1 kW / m 2, a spectral distribution close to solar radiation through AM ( airmass ) of 1.5 and a cell temperature 25 �C . The resistive load is varied until the peak or maximum power point ( MPP ) is achieved.
