Convert Kilolux to Phots (klx to ph)
1 kilolux (klx) = 0.1 phots (ph). 1 ph = 10 klx. Example: 15 klx = 15 × 0.1 = 1.5 ph.
Also searched as kilolux to ph, kilolux in ph, kilolux into phots, klx to ph, klx in phots, klx into phot, kilolux to phot, klx to phots converter and how many phots in a kilolux.
1 klx = 0.1 ph
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilolux to phot converter to paste a column from Excel.
How to Convert Kilolux to Phot
- 1 klx = 0.1 ph
- 1 ph = 10 klx
- Example: convert 15 klx to ph: 15 klx = 15 × 0.1 ph = 1.5 ph
Formula
ph = klx ÷ 10
Derivation from SI units:
- 1 klx = 10³ lx.
- 1 ph = 1 lm/cm² = 10⁴ lx.
- 1 klx = 1000 lx ÷ 10000 lx per ph = 0.1 ph
Both units are defined exactly, so the factor is exact. Kilolux definition: kilolux; Phot definition: phot.
Worked examples
- A reading of 20 klx converts to 2 ph.
20 klx × 0.1 = 2 ph - A value of 75 klx is 7.5 ph.
75 klx × 0.1 = 7.5 ph
Kilolux to Phot conversion table
| Kilolux (klx) | Phots (ph) |
|---|---|
| 1 klx | 0.1 ph |
| 5 klx | 0.5 ph |
| 10 klx | 1 ph |
| 20 klx | 2 ph |
| 32 klx | 3.2 ph |
| 50 klx | 5 ph |
| 75 klx | 7.5 ph |
| 100 klx | 10 ph |
| 120 klx | 12 ph |
| 130 klx | 13 ph |
Where it's used
Kilolux are used for daylight and solar measurements, while phots appear in older optics literature. Both measure illuminance (light falling on a surface), so the conversion is a fixed factor.
Kilolux to other illuminance units
| Conversion | 1 klx equals |
|---|---|
| kilolux to phot | 0.1 ph |
| kilolux to lux | 1000 lx |
| kilolux to foot-candle | 92.90304 fc |
| kilolux to millilux | 1000000 mlx |
Frequently asked questions
How many phots are in 1 kilolux?
1 klx = 0.1 ph.
How do I convert kilolux to phots?
Multiply the value in klx by 0.1, or divide it by 10. For example, 15 klx × 0.1 = 1.5 ph.
Is the klx to ph conversion exact?
Yes. Both units are defined exactly, and 1 klx is exactly 0.1 ph.
Sources
- 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).
- 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".
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 Kilolux to Phots (klx to ph). Retrieved October 25, 2026, from https://scientificconverters.com/illuminance/kilolux-to-phots/
IEEE
Scientific Converters, "Convert Kilolux to Phots (klx to ph)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/illuminance/kilolux-to-phots/