Convert Phots to Kilolux (ph to klx)
1 phot (ph) = 10 kilolux (klx). 1 klx = 0.1 ph. Example: 15 ph = 15 × 10 = 150 klx.
Also searched as phots to klx, phots in klx, phots into kilolux, ph to klx, ph in kilolux, ph into kilolux, phot to kilolux, ph to kilolux converter and how many kilolux in a phot.
1 ph = 10 klx
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk phot to kilolux converter to paste a column from Excel.
How to Convert Phot to Kilolux
- 1 ph = 10 klx
- 1 klx = 0.1 ph
- Example: convert 15 ph to klx: 15 ph = 15 × 10 klx = 150 klx
Formula
klx = ph × 10
Derivation from SI units:
- 1 ph = 1 lm/cm² = 10⁴ lx.
- 1 klx = 10³ lx.
- 1 ph = 10000 lx ÷ 1000 lx per klx = 10 klx
Both units are defined exactly, so the factor is exact. Phot definition: phot; Kilolux definition: kilolux.
Worked examples
- A reading of 2 ph converts to 20 klx.
2 ph × 10 = 20 klx - A value of 20 ph is 200 klx.
20 ph × 10 = 200 klx
Phot to Kilolux conversion table
| Phots (ph) | Kilolux (klx) |
|---|---|
| 0.1 ph | 1 klx |
| 0.5 ph | 5 klx |
| 1 ph | 10 klx |
| 2 ph | 20 klx |
| 5 ph | 50 klx |
| 10 ph | 100 klx |
| 20 ph | 200 klx |
| 50 ph | 500 klx |
| 100 ph | 1000 klx |
| 1000 ph | 10000 klx |
Where it's used
Phots are used for older optics literature, while kilolux appear in daylight and solar measurements. Both measure illuminance (light falling on a surface), so the conversion is a fixed factor.
Phot to other illuminance units
| Conversion | 1 ph equals |
|---|---|
| phot to kilolux | 10 klx |
| phot to lux | 10000 lx |
| phot to foot-candle | 929.0304 fc |
| phot to millilux | 10000000 mlx |
Frequently asked questions
How many kilolux are in 1 phot?
1 ph = 10 klx.
How do I convert phots to kilolux?
Multiply the value in ph by 10. For example, 15 ph × 10 = 150 klx.
Is the ph to klx conversion exact?
Yes. Both units are defined exactly, and 1 ph is exactly 10 klx.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "phot".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (becquerel, gray, sievert, lux) and Table 2 (candela).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Phots to Kilolux (ph to klx). Retrieved October 25, 2026, from https://scientificconverters.com/illuminance/phots-to-kilolux/
IEEE
Scientific Converters, "Convert Phots to Kilolux (ph to klx)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/illuminance/phots-to-kilolux/