Luminous Efficacy
Calculate luminous efficacy and power requirements for various light sources. Luminous efficacy is the ratio of luminous flux (lumens) to power (watts), determining how efficiently a light source produces visible light.
Luminous Efficacy Calculator
Luminous Efficacy (η) is the ratio of luminous flux to power:
η = Φ / P
Where:
- η = Luminous efficacy (lumens/W)
- Φ = Luminous flux (lumens, lm)
- P = Power (W)
You can also calculate required power: P = Φ / η