Instructions

HD2402 - 7 - V1.3
R (λ) Spectral weighting taking into account the wavelength de
p
endence of the
thermal injury caused to the eye by visible and IRA radiation [dimen-
sionless];
L
R
Effective radiance
(
thermal in
j
ur
y)
: calculated radiance s
p
ectrall
y
wei
g
hted
by R(λ), expressed in watts per square meter per steradian per nanometer
[W/(m
2
sr)];
B (λ) Spectral weighting taking into account the wavelength de
p
endence of the
photochemical injury caused to the eye by the blue light radiation [dimen-
sionless];
L
B
Effective radiance (blue light): calculated radiance spectrally weighted by B
(λ), expressed in watts per square meter per steradian [W/(m
2
sr)];
E
B
Effective irradiance (blue light): calculated irradiance spectrally weighted b
y
B (λ), expressed in watts per square meter [W/m
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 me-
ter [W/m
2
];
E
skin
Total irradiance (visible, IRA and IRB): calculated irradiance within the visi-
ble and infrared wavelength range 380 nm to 3 000 nm, ex
p
ressed in watts
per square meter [W/m
2
];
H
skin
Radiant ex
p
osure, the time and wavelen
g
th inte
g
ral or sum of the irradiance
within the visible and infrared wavelength range 380 nm to 3 000 nm, ex-
pressed in joule per square meter [J/m
2
];
α Angular subtense: the angle subtended by an apparent source, as observed
at a point in space, expressed in milliradians (mrad). A
pp
arent source in the
real or virtual object that forms the smallest possible retinal image.
Limits depend on the wavelengths of the analyzed light and on the kind of injury to be
taken into consideration.
Also the physical quantities of interest (irradiance [W/m
2
], radiance [W/(m
2
sr)]) differ
depending on the kind of injury to be taken into consideration.