To determine the illumination produced by a lamp at a certain distance, use the inverse square law formula.
The illumination produced by a lamp can be calculated using the inverse square law formula:
Intensity = Power / (4πr2)
where
Power = 550 cd (candela) = 550 lumens
r = 5 m (distance)
Plugging in the values, the illumination will be:
Intensity = 550 / (4π 52)
Intensity = 550 / (4π 25)
Intensity ≈ 1.1 cd
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