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Photometry
Brightness
brightness
B =
cd/m
2
x
cd/m
2
luminous intensity
I
=
cd
x
cd
area of luminous surface
S =
m
2
x
mm
2
cm
2
dm
2
m
2
km
2
a
ha
in
2
ft
2
yd
2
1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"
