Lighting

Watts to Lux Calculation — ChiefEngineer.in

Worked step-by-step example. Estimate illuminance from power, efficacy and area. Open interactive calculator →

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Result

Illuminance
100 lx

Formula

E = P × ηv / A

Variables

  • P — power (W)
  • ηv — efficacy (lm/W)
  • A — area (m²)

Worked Example

Input: 10 W, 100 lm/W, 10 m²

Result: E = 100 lx

Assumptions & Notes

Uniform-illumination estimate.

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