Convert Watts (at 555 nm) to Microlumens
Convert Watts (at 555 nm) (W₅₅₅) to Microlumens (µlm) instantly and accurately.
Conversion Formula
µlm = W₅₅₅ × 683000000
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 Microlumens
The microlumen (µlm) equals 10⁻⁶ lm. LED indicators in deep-sleep power-save mode, fiber-optic signal pilots, and OLED display pixels at minimum brightness fall into this range. Equivalent to a 555 nm source radiating approximately 1.46 nW of radiant power. A night-vision display backlight operates at 1-100 µlm. 1 µlm = 10⁻⁶ lm.
Quick Reference Table
| Watts (at 555 nm) (W₅₅₅) | Microlumens (µlm) |
|---|---|
| 1 W₅₅₅ | 683000000 µlm |
| 2 W₅₅₅ | 1.366 × 109 µlm |
| 5 W₅₅₅ | 3.415 × 109 µlm |
| 10 W₅₅₅ | 6.83 × 109 µlm |
| 25 W₅₅₅ | 1.708 × 1010 µlm |
| 50 W₅₅₅ | 3.415 × 1010 µlm |
| 100 W₅₅₅ | 6.83 × 1010 µlm |