Convert Nanolumens to Watts (at 555 nm)
Convert Nanolumens (nlm) to Watts (at 555 nm) (W₅₅₅) instantly and accurately.
Conversion Formula
W₅₅₅ = nlm × 1.464128843e-12
About Nanolumens
The nanolumen (nlm) equals 10⁻⁹ lm. The scale of single-cell bioluminescence: an individual bioluminescent bacterium emits roughly 1-100 nlm; a luciferin-luciferase reaction in a single cell reaches the low-nanolumen range. Also the range for fiber-optic evanescent-wave sensors and fluorescence microscopy background levels. 1 nlm = 10⁻⁹ 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
| Nanolumens (nlm) | Watts (at 555 nm) (W₅₅₅) |
|---|---|
| 1 nlm | 1.464 × 10-12 W₅₅₅ |
| 2 nlm | 2.928 × 10-12 W₅₅₅ |
| 5 nlm | 7.321 × 10-12 W₅₅₅ |
| 10 nlm | 1.464 × 10-11 W₅₅₅ |
| 25 nlm | 3.66 × 10-11 W₅₅₅ |
| 50 nlm | 7.321 × 10-11 W₅₅₅ |
| 100 nlm | 1.464 × 10-10 W₅₅₅ |