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Photometry
Light energy
luminous energy
Q =
lm·s
x
lm·s
lm·h
luminous flux
Φ =
lm
x
lm
time
t =
s
x
ps
ns
μs
ms
s
min
h
d
y
1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"