${\displaystyle {\eta }_{\text{B}}=\frac{{\displaystyle \int {\Phi }_{\text{e}\text{,}\lambda }\text{(}\lambda \text{)}B\text{(}\lambda \text{)}}\text{d}\lambda }{{\displaystyle \int {\Phi }_{\text{e}\text{,}\lambda }\text{(}\lambda \text{)}}\text{d}\lambda }}$

Note 1 to entry: The blue light hazard efficiency of radiation, η_B, is related to the blue light hazard efficacy of luminous radiation, K_B,v, through η_B = K·K_B,v, where K is luminous efficacy of radiation, and to the blue light hazard factor of luminous radiation, α_B,v, through η_B = V·α_B,v, where V is luminous efficiency of radiation.

Note 2 to entry: For some applications it might be necessary to state both blue light hazard efficiency of radiation, η_B, and blue light hazard efficacy of luminous radiation, K_B,v.

Note 3 to entry: The blue light hazard efficiency of radiation has unit one.