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Distance for Illuminance Calculator

Compute required distance d = √(I/E) for a target illuminance.

Input Data

Input Luminous intensity I.
cd
Input Target illuminance E.
lx

Results

2m
d = √(I/E).

At a glance:Distance for Illuminance Calculator: enter parameters to compute results; complements related calculators.

Formula

d = √( I / E ).

How to Use

  1. Enter luminous intensity and target illuminance.
  2. It returns required distance.

Case Studies

I=1000 cd, E=250 lx → d=2 m

d = √(1000/250) = √4 = 2 m.

FAQ

Practical use?

Plan luminaire mounting height so the work plane meets the target illuminance.

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:Distance for Illuminance Calculator（/light/distance-for-illuminance）。