| Formula | Calculator | Reverse units |
|---|---|---|
| 1 lumen = 1 candela steradian | Factors for candela steradian | |
| 1 lumen = 1 lux square meter | Factors for lux square meter | |
| 1 lumen = 0.001464129 watt (at 540 THz) | Factors for watt (at 540 THz) | |
| 1 lumen = 0.001470588 watt (at 5550 angstrom) | Factors for watt (at 5550 angstrom) | |
| 1 lumen = 0.001459854 watt (green light , 100% efficiency) | Factors for watt (green light , 100% efficiency) |