Convert Watts (at 555 nm) to Picolumens
Convert Watts (at 555 nm) (W₅₅₅) to Picolumens (plm) instantly and accurately.
Conversion Formula
plm = W₅₅₅ × 683000000000000
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 Picolumens
The picolumen (plm) equals 10⁻¹² lm. A sub-unit used only in precision optical metrology and photomultiplier calibration chains. Equivalent to the photometric output of a 555 nm monochromatic source radiating approximately 1.46 fW of radiant power. Below the sensitivity threshold of most photometric instruments without special cooling. 1 plm = 10⁻¹² lm.
Quick Reference Table
| Watts (at 555 nm) (W₅₅₅) | Picolumens (plm) |
|---|---|
| 1 W₅₅₅ | 6.83 × 1014 plm |
| 2 W₅₅₅ | 1.366 × 1015 plm |
| 5 W₅₅₅ | 3.415 × 1015 plm |
| 10 W₅₅₅ | 6.83 × 1015 plm |
| 25 W₅₅₅ | 1.708 × 1016 plm |
| 50 W₅₅₅ | 3.415 × 1016 plm |
| 100 W₅₅₅ | 6.83 × 1016 plm |