Convert Phots to Picolux
Convert Phots (ph) to Picolux (plx) instantly and accurately.
Conversion Formula
plx = ph × 1.000000000e+16
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 Wholly superseded by lux and kilolux in modern standards. 1 ph = 10⁴ lx.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 Picolux
The picolux (plx) equals 10⁻¹² lx. A theoretical subunit used only in precision photometric standard traceability. Even the faintest measurable natural illuminance - starlight on a moonless night at ~200 nlx - is 200 billion times brighter. Appears only in SI reference chains for calibration laboratories. 1 plx = 10⁻¹² lx.
Quick Reference Table
| Phots (ph) | Picolux (plx) |
|---|---|
| 1 ph | 1 × 1016 plx |
| 2 ph | 2 × 1016 plx |
| 5 ph | 5 × 1016 plx |
| 10 ph | 1 × 1017 plx |
| 25 ph | 2.5 × 1017 plx |
| 50 ph | 5 × 1017 plx |
| 100 ph | 1 × 1018 plx |