blue light hazard efficacy of luminous radiation, <of a source>

K_B,v

quotient of blue light hazard weighted radiant flux, Φ_B, and luminous flux, Φ_v

where λ is wavelength, Φ_e,λ(λ) is spectral radiant flux, B(λ) is the blue light hazard spectral weighting function, V(λ) is the CIE spectral luminous efficiency function for photopic vision, and K_m is maximum luminous efficacy (≈ 683 lm·W⁻¹)

Note 1 to entry: The term "luminous radiation" refers to optical radiation weighted with the CIE spectral luminous efficiency function for photopic vision, V(λ).

Note 2 to entry: The use of this term is only reasonable if parts of the optical radiation are in the visible range and thus Φ_v ≠ 0.

Note 3 to entry: The blue light hazard efficacy of luminous radiation is expressed in watt per lumen (W·lm⁻¹), possibly with a metric prefix.