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cieblh

The cieblh function evaluates the Blue Light Hazard for a given spectral radiance L_{e,\lambda} according to CIE S 009. 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:

blh = cieblh(lam,L,t)

Where:

ParameterDescription
blhIs a struct containing the Blue Light Hazard value (BLH) according to the CIE, an indicator if the exposure is hazardeous (hazard = ‘yes’ or ‘no’) and the max allowed exposure time t_{max } in s.
lamIs a vector containing the wavelength steps. For wavelength steps smaller than 1 nm, the function does a linear interpolation for the reference spectrum, as suggested by the CIE.
LIs a vector or a matrix containing the illuminant’s spectral radiance L_{e,\lambda}.
tIs the exposure time in s.

Examples:

Blue Light Hazard for standard illuminant ‘D65’ with 5 s exposure time:

lam = 380:780;
Le  = ciespec(lam,'D65');
blh = cieblh(lam,Le,5)

See also: ciespec

Result:

blh =
   
      scalar structure containing the fields:

      BLH = 2.4279e+07
      hazard = 'yes'
      tmax = 28.3793

Blue Light Hazard for standard illuminant ‘LED-B1’ with 5 s exposure time:

lam = 380:780;
Le  = ciespec(lam,'LED-B1');
blh = cieblh(lam,Le,5)

See also: ciespec

Result:

blh =

    scalar structure containing the fields:

    BLH = 8.9982e+05
    hazard = no
    tmax = 311.81

Reference

IEC 62471:2006/CIE S 009:2002: Photobiological safety of lamps and lamp systems / Sécurité photobiologique des lampes et des appareils utilisant des lampes (bilingual edition). Commission Internationale de l'Éclairage (CIE), Vienna Austria, 2002.

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