Lighting

Candela to Lux Calculation — ChiefEngineer.in

Worked step-by-step example. Convert candela to illuminance at a distance (inverse-square law). Open interactive calculator →

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Result

Illuminance
25 lx

Formula

E = I / r²

Variables

  • E — illuminance (lx)
  • I — luminous intensity (cd)
  • r — distance (m)

Worked Example

Input: I = 100 cd, r = 2 m

Result: E = 25 lx

Assumptions & Notes

Point-source approximation, surface perpendicular to light. Real luminaires need photometric data.

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