frudawski

# ciespec2aopic

The ciespec2aopic function derives the \alpha-opic quantities from any given spectral power distribution(s). Any errors in the data set or in results generated with the Lighting Toolbox are not in the liability of the CIE nor me, see licence.

Note: the result is given in \textrm{W}\cdot \textrm{m}^{-2} , in literature the results are often given in \textrm{mW}\cdot \textrm{m}^{-2} .

Usage:

aopic = ciespec2aopic(lam,spec)

Where:

Examples

Derive \alpha-opic values from standard illuminant ‘A’ with illuminance of E = 100~\textrm{lx}:

lam = 360:830;
spec = ciespec(lam,'A');
% normalize to 100 lx
E = spec.*100./ciespec2Y(lam,spec);
aopic = ciespec2aopic(lam,E)

Result:

aopic =

0.025419   0.117426   0.165669   0.083080   0.065754

Derive \alpha-opic values from standard illuminant ‘D55’, ‘D65’ and ‘D75’ with illuminances of E = 100~\textrm{lx}:

lam = 360:830;
spec = ciespec(lam,{'D55','D65','D75'});
% normalize to 100 lx
E = spec.*100./ciespec2Y(lam,spec);
aopic = ciespec2aopic(lam,E)

Result:

aopic =

0.068531   0.141099   0.162862   0.133744   0.119892
0.081729   0.145582   0.162890   0.144970   0.132621
0.092530   0.148941   0.163030   0.153757   0.142691

This means:

CIE S 026/E:2018: CIE System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light. Commission International de l’Éclairage (CIE), Vienna Austria, 2018, (DOI: 10.25039/S026.2018).