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Photometry
Radiance
radiance
B
e
=
W/(sr·m
2
)
x
W/(sr·m
2
)
radiation (or absorption) power, radiant flux
Φ
e
=
W
x
W
solid angle
Ω =
sr
x
sr
□°
area of surface of emitting source
S
em
=
m
2
x
mm
2
cm
2
dm
2
m
2
km
2
a
ha
in
2
ft
2
yd
2
angle between direction of radiation propagation and normal to surface
α =
rad
x
μrad
mrad
rad
°
gon
1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"
