Convert Millilumens to Watts (at 555 nm)
Convert Millilumens (mlm) to Watts (at 555 nm) (W₅₅₅) instantly and accurately.
Conversion Formula
W₅₅₅ = mlm × 1.464128843e-6
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.
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.
Quick Reference Table
| Millilumens (mlm) | Watts (at 555 nm) (W₅₅₅) |
|---|---|
| 1 mlm | 1.464 × 10-6 W₅₅₅ |
| 2 mlm | 2.928 × 10-6 W₅₅₅ |
| 5 mlm | 7.321 × 10-6 W₅₅₅ |
| 10 mlm | 1.464 × 10-5 W₅₅₅ |
| 25 mlm | 3.66 × 10-5 W₅₅₅ |
| 50 mlm | 7.321 × 10-5 W₅₅₅ |
| 100 mlm | 0.000146413 W₅₅₅ |