The cieedq function determines the \alpha-opic equivalent daylight (‘D65’) quantity for a given spectrum according to CIE S 026, e. g. the melanopic equivalent daylight illuminance (MEDI). 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.
Usage:
edq = cieedq(lam,spec,'reference')
Where:
| Parameter | Description |
edq | Is the reurned \alpha-opic equivalent daylight (‘D65’) quantity. |
lam | Specifies the wavelengths. |
spec | Specifies the spectral power distribution (SPD). |
'reference' | Defines the \alpha-opic reference: ‘sc’ for s-cone-opic ‘mc’ for m-cone-opic ‘lc’ for l-cone-opic ‘rh’ for rhodopic or scotopic ‘mel’ for melanopic ‘a-opic’ or ‘aopic’ for sc, mc ,lc, rh, mel |
Examples
Melanopic equivalent daylight (‘D65’) illuminance (MEDI) of standard illuminant ‘A’ with a resulting illuminance of E = 100~\textrm{lx}:
lam = 380:780; spec = ciespec(lam,'A',100); % determine MEDI value medi = cieedq(lam,spec,'mel')
See also: ciespec, ciespec2Y, ciemedi
Result:
medi = 49.743
This means, with 49.6 lx of ‘D65’ daylight the same melanopic stimulus is achieved.
Determine \alpha-opic equivalent daylight (‘D65’) illuminances (EDI) of standard illuminant ‘FL12’ with a resulting illuminance of E = 100~\textrm{lx}:
lam = 380:780; spec = ciespec(lam,'FL12',100); edi = cieedq(lam,spec,'aopic')
Result:
edi =
35.929 79.904 100.440 50.848 40.420
This means:
E_{v,sc}^{D65} = 35.929~\textrm{lx} E_{v,mc}^{D65} = 79.904~\textrm{lx} E_{v,lc}^{D65} = 100.440~\textrm{lx} E_{v,rh}^{D65} = 50.848~\textrm{lx} E_{v,mel}^{D65} = 40.420~\textrm{lx}Reference: