frudawski

# ciespec2Y

The ciespec2Y function calculates the integrated photometric value Y of a V(\lambda) weighted spectral power distribution. Any errors in the data set or in results generated from the reference data or the Lighting Toolbox are not in the liability of the CIE nor me, see licence.

Y = ciespec2Y(lam,spec,k)

Where:

Note: alternatively one can use the function ciespec2unit with reference ‘y’ or ciespec2xyz.

Examples

Determine the photometric value from the spectral power distribution of standard illuminant ‘A’:

lam = 360:830;
spec = ciespec(lam,'A');
Y = ciespec2Y(lam,spec)

Result:

Y = 7.3689e+06

Determine the photometric values from the spectral power distributions of standard illuminant ‘D55’ and ‘D65’:

lam = 360:830;
spec = ciespec(lam,{'D55','D65'});
Y = ciespec2Y(lam,spec)

Y =
7.2173e+06
ISO/CIE 11664-1:2019(E): Colorimetry - Part 1: CIE standard colorimetric observers. Commission International de l’Éclairage (CIE), Vienna Austria, 2019.