Convert Watts (at 555 nm) to Megalumens
Convert Watts (at 555 nm) (W₅₅₅) to Megalumens (Mlm) instantly and accurately.
Conversion Formula
Mlm = W₅₅₅ × 0.000683
About Watts (at 555 nm)
The watt at 555 nm equals 683 lm exactly, by the 2019 SI definition fixing the luminous efficacy constant K_cd = 683 lm/W at 540 THz (≈ 555 nm, the peak of the photopic eye-sensitivity curve V(λ)). Used in LED optical design and photonics research to convert between radiometric power and photometric flux at peak eye sensitivity. 1 W₅₅₅ = 683 lm.
About Megalumens
The megalumen (Mlm) equals 10⁶ lm. The output range for high-bay industrial luminaires and stadium floodlights: a 1 000 W high-pressure sodium lamp array produces approximately 1.1 Mlm; full LED stadium lighting systems reach 1-10 Mlm; maritime lighthouse optics emit in the low-megalumen range. 1 Mlm = 10⁶ lm.
Quick Reference Table
| Watts (at 555 nm) (W₅₅₅) | Megalumens (Mlm) |
|---|---|
| 1 W₅₅₅ | 0.000683 Mlm |
| 2 W₅₅₅ | 0.001366 Mlm |
| 5 W₅₅₅ | 0.003415 Mlm |
| 10 W₅₅₅ | 0.00683 Mlm |
| 25 W₅₅₅ | 0.017075 Mlm |
| 50 W₅₅₅ | 0.03415 Mlm |
| 100 W₅₅₅ | 0.0683 Mlm |