Calculate too:
Law of radioactive decay

Photometry



Luminous intensity measurement


I2
cd
I1
cd
r2
m
r1
m

1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"




variables:

I2 - luminous intensity of second source (two sources bring identical illuminance to identical surfaces)
I1 - luminous intensity of second source (two sources bring identical illuminance to identical surfaces)
r2 - distance from second light source to illuminated surface
r1 - distance from first light source to illuminated surface



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