# Annex 3: Non-coherent optical radiation

*Numbering (a) to (o) refers to corresponding rows of Table 3.1.*

a) | (H_{eff} is only relevant in the range 180 to 400 nm) | |

b) | (H_{UVA} is only relevant in the range 315 to 400 nm) | |

c), d) | (L_{B} is only relevant in the range 300 to 700 nm) | |

e), f) | (E_{B} is only relevant in the range 300 to 700 nm) | |

g)-l) | (See Table 1.1 for appropriate values of λ_{1} and λ_{2} ) | |

m), n) | (E_{IR} is only relevant in the range 780 to 3000 nm) | |

o) | (H_{skin} is only relevant in the range 380 to 3000 nm) |

a) | and (H_{eff} = E_{eff} · Δt) | |

b) | and (H_{UVA} = E_{UVA} · Δt) | |

c), d) | [formula missing, see Norwegian version] | |

e), f) | ||

g) - l) | (See Table 1.1 for appropriate values of λ_{1} and λ_{2} ) | |

m), n) | ||

o) | and (H_{skin} = E_{skin} · Δt) |

*Notes:*

Eλ (λ,t), Eλ | spectral irradiance or spectral power density: the radiant power incident per unit area upon a surface, expressed in watts per square metre per nanometre [Wm^{-2} nm-1]; [Wm^{-2} nm^{-1}]; values of Eλ (λ, t) and E_{λ} come from measurements or may be provided by the manufacturer of the equipment; |

E_{eff} | effective irradiance (UV range): calculated irradiance within the UV wavelength range 180 to 400 nm spectrally weighted by S (λ); expressed in watts per square metre [Wm^{-2}]; |

H | radiant exposure: the time integral of the irradiance, expressed in joules per square metre (Jm^{-2} ); |

H_{eff} | effective radiant exposure: radiant exposure spectrally weighted by S (λ), expressed in joules per square metre [Jm^{-2}]; |

E_{UVA} | total irradiance (UVA): calculated irradiance within the UVA wavelength range 315 to 400 nm, expressed in watts per square metre [Wm^{-2}]; |

H_{UVA} | radiant exposure: the time and wavelength integral or sum of the irradiance within the UVA wavelength range 315 to 400 nm, expressed in joules per square metre [Jm^{-2}]; |

S (λ) | spectral weighting: taking into account the wavelength dependence of the health effects of UV radiation on eye and skin (Table 1.2) [dimensionless]; |

t, Δt | time, duration of the exposure, expressed in seconds [s]; |

λ | wavelength, expressed in nanometres [nm]; |

Δ λ | bandwidth: expressed in nanometres [nm], of the calculation or measurement intervals; |

Lλ (λ), Lλ | spectral radiance of the source expressed in watts per square metre per steradian per nanometre [W m^{-2} sr^{-1} nm^{-1}]; |

R (λ) | spectral weighting: taking into account the wavelength dependence of the thermal injury caused to the eye by visible and IRA radiation (Table 1.3) [dimensionless]; |

LR | effective radiance (thermal injury): calculated radiance spectrally weighted by R (λ) (λ), expressed in watts per square metre per steradian [Wm^{-2} sr^{-1}]; |

B (λ) | spectral weighting: taking into account the wavelength dependence of the photochemical injury caused to the eye by blue light radiation (Table 1.3) [dimensionless]; |

L_{R} | effective radiance (blue light): calculated radiance spectrally weighted by R (λ) (λ), expressed in watts per square metre per steradian [Wm^{-2} sr^{-1}]; |

E_{B} | effective irradiance (blue light): calculated irradiance, spectrally weighted by B (λ), expressed in watts per square metre [Wm^{-2}]; |

E_{IR} | total irradiance (thermal injury): calculated irradiance within the infrared wavelength range 780 nm to 3 000 nm expressed in watts per square metre [Wm^{-2}]; |

E_{skin} | total irradiance (visible, IRA and IRB): calculated irradiance within the visible and infrared wavelength range 380 nm to 3 000 nm, expressed in watts per square metre [Wm^{-2}]; |

H_{skin} | radiant exposure: the time and wavelength integral or sum of the irradiance within the visible and infrared wavelength range 380 to 3 000 nm, expressed in joules per square metre [Jm^{-2}]; |

α | angular subtense: the angle subtended by an apparent source, as viewed at a point in space, expressed in milliradians (mrad). Apparent source is the real or virtual object that forms the smallest possible retinal image. |