Lux to Phot
1 Lux equals 0.0001 Phot using exact lux-based illuminance definitions.
Direct Answer
1 Lux equals 0.0001 Phot
This conversion uses exact lux-based illuminance definitions.
For 10 Lux, the result equals 0.001 Phot.
Converter Calculator
0.0001 Phot (ph)
SwitchExplanation
Formula: Phot = Lux × 0.0001. Why: phot is tied exactly to lux through the square-centimeter to square-meter area relationship, so the route normalizes through lux before applying the target unit.
Lux (lx): the SI derived unit of illuminance, equal to one lumen incident on one square meter of surface area.
Phot (ph): a CGS illuminance unit equal to one lumen per square centimeter, which is exactly 10,000 lux.
This route is useful when comparing phot-based CGS illuminance values against modern lux-based references in laboratory, optical, and legacy technical material.
This conversion is purely multiplicative because both units reduce through lux using fixed illuminance definitions with no offset.
Common Conversion Values
| Lux (lx) | Phot (ph) |
|---|---|
| 1 | 0.0001 |
| 10 | 0.001 |
| 50 | 0.005 |
| 100 | 0.01 |
| 300 | 0.03 |
| 500 | 0.05 |
| 1,000 | 0.1 |
| 10,000 | 1 |
Frequently Asked Questions
What is 1 lux in phot?
1 Lux equals 0.0001 Phot on this page.
Does this Lux to Phot page use the exact lux relationship for phot?
Yes. Phot routes use the exact relationship 1 phot = 10,000 lux through one lux normalization path, so CGS and modern lighting references stay consistent across the page.
When would I convert lux to phot?
This route is useful when comparing phot-based CGS illuminance values against modern lux-based references in laboratory, optical, and legacy technical material.
How do I reverse Lux to Phot?
Use the mirror Phot to Lux route; it applies the inverse relationship with the same illuminance assumptions.