Lighting

Lumens to Watts Calculation — ChiefEngineer.in

Worked step-by-step example. Convert luminous flux to electrical power using luminous efficacy. Open interactive calculator →

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Result

Power
10 W

Formula

P = Φv / ηv

Variables

  • Φv — flux (lm)
  • ηv — efficacy (lm/W)
  • P — power (W)

Worked Example

Input: 1000 lm, 100 lm/W

Result: P = 10 W

Assumptions & Notes

Requires luminous efficacy (varies by source, driver and operating conditions).

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