Convert Phots to Nanolux
Convert Phots (ph) to Nanolux (nlx) instantly and accurately.
Conversion Formula
nlx = ph × 10000000000000
About Phots
The phot (ph) equals 1 lm/cm² = 10 000 lx. The CGS-photometric unit of illuminance. Pre-SI optics texts express daylight in phots: full tropical sunshine is ~10 ph (100 klx); overcast sky ~0.1-0.2 ph. Wholly superseded by lux and kilolux in modern standards. 1 ph = 10⁴ lx.
About Nanolux
The nanolux (nlx) equals 10⁻⁹ lx. Astronomical night-sky scale: the zodiacal band contributes ~10-50 nlx; airglow ~150 nlx; the Milky Way core ~100 nlx. The absolute human eye threshold is around 100 nlx. Used in night-sky quality metrics and photomultiplier tube calibration. 1 nlx = 10⁻⁹ lx.
Quick Reference Table
| Phots (ph) | Nanolux (nlx) |
|---|---|
| 1 ph | 1 × 1013 nlx |
| 2 ph | 2 × 1013 nlx |
| 5 ph | 5 × 1013 nlx |
| 10 ph | 1 × 1014 nlx |
| 25 ph | 2.5 × 1014 nlx |
| 50 ph | 5 × 1014 nlx |
| 100 ph | 1 × 1015 nlx |