Convert Picolux to Phots
Convert Picolux (plx) to Phots (ph) instantly and accurately.
Conversion Formula
ph = plx × 1.000000000e-16
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.
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 Wholly superseded by lux and kilolux in modern standards. 1 ph = 10⁴ lx.
Quick Reference Table
| Picolux (plx) | Phots (ph) |
|---|---|
| 1 plx | 1 × 10-16 ph |
| 2 plx | 2 × 10-16 ph |
| 5 plx | 5 × 10-16 ph |
| 10 plx | 1 × 10-15 ph |
| 25 plx | 2.5 × 10-15 ph |
| 50 plx | 5 × 10-15 ph |
| 100 plx | 1 × 10-14 ph |