Convert Watts (at 555 nm) to Millilumens
Convert Watts (at 555 nm) (W₅₅₅) to Millilumens (mlm) instantly and accurately.
Conversion Formula
mlm = W₅₅₅ × 683000
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 Millilumens
The millilumen (mlm) equals 10⁻³ lm. The output range for typical LED indicator packages: a standard 5 mm through-hole LED at 20 mA produces 10-200 mlm depending on color and efficiency. Small wearable health-monitor LEDs and remote-control emitter LEDs operate in this range. 1 mlm = 10⁻³ lm.
Quick Reference Table
| Watts (at 555 nm) (W₅₅₅) | Millilumens (mlm) |
|---|---|
| 1 W₅₅₅ | 683000 mlm |
| 2 W₅₅₅ | 1366000 mlm |
| 5 W₅₅₅ | 3415000 mlm |
| 10 W₅₅₅ | 6830000 mlm |
| 25 W₅₅₅ | 17075000 mlm |
| 50 W₅₅₅ | 34150000 mlm |
| 100 W₅₅₅ | 68300000 mlm |