Convert Phots to Microlux
Convert Phots (ph) to Microlux (µlx) instantly and accurately.
Conversion Formula
µlx = ph × 10000000000
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 Wholly superseded by lux and kilolux in modern standards. 1 ph = 10⁴ lx.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 Microlux
The microlux (µlx) equals 10⁻⁶ lx. Natural night illuminance: a moonless overcast sky ~100 µlx; scattered starlight ~200-300 µlx; crescent moon ~10-50 µlx. Used in night-vision equipment sensitivity specifications and observatory site-quality assessments. 1 µlx = 10⁻⁶ lx.
Quick Reference Table
| Phots (ph) | Microlux (µlx) |
|---|---|
| 1 ph | 1 × 1010 µlx |
| 2 ph | 2 × 1010 µlx |
| 5 ph | 5 × 1010 µlx |
| 10 ph | 1 × 1011 µlx |
| 25 ph | 2.5 × 1011 µlx |
| 50 ph | 5 × 1011 µlx |
| 100 ph | 1 × 1012 µlx |