Convert Phots to Kilolux
Convert Phots (ph) to Kilolux (klx) instantly and accurately.
Conversion Formula
klx = ph × 10
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 Wholly superseded by lux and kilolux in modern standards. 1 ph = 10⁴ lx.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 Kilolux
The kilolux (klx) equals 1 000 lx. Outdoor daytime scale: overcast sky ~10-20 klx; direct mid-latitude sunshine at noon ~80-100 klx. Required for fine inspection work, surgery, and color-critical print evaluation (ISO 3664: 2 klx). Also the range for plant-growth LED systems at canopy level. 1 klx = 10³ lx.
Quick Reference Table
| Phots (ph) | Kilolux (klx) |
|---|---|
| 1 ph | 10 klx |
| 2 ph | 20 klx |
| 5 ph | 50 klx |
| 10 ph | 100 klx |
| 25 ph | 250 klx |
| 50 ph | 500 klx |
| 100 ph | 1000 klx |