Convert Lux to Phot
Live bidirectional calculator for Lux (lx) and Phots (ph) with verified formula and conversion charts.
Illuminance5 units
How the Calculation Works (Linear Scaling)
Since 1 Phot = 10000 Lux, divide the value in Lux by 10000.
Lux to Phot Conversion Table
Precomputed values for quick reference and printing.
| Lux | Phot |
|---|---|
| 1 lx | 0.0001 ph |
| 2 lx | 0.0002 ph |
| 3 lx | 0.0003 ph |
| 4 lx | 0.0004 ph |
| 5 lx | 0.0005 ph |
| 6 lx | 0.0006 ph |
| 7 lx | 0.0007 ph |
| 8 lx | 0.0008 ph |
| 9 lx | 0.0009 ph |
| 10 lx | 0.001 ph |
| 15 lx | 0.0015 ph |
| 20 lx | 0.002 ph |
| 25 lx | 0.0025 ph |
| 30 lx | 0.003 ph |
| 40 lx | 0.004 ph |
| 50 lx | 0.005 ph |
| 75 lx | 0.0075 ph |
| 100 lx | 0.01 ph |
| Phot | Lux |
|---|---|
| 1 ph | 10000 lx |
| 2 ph | 20000 lx |
| 3 ph | 30000 lx |
| 4 ph | 40000 lx |
| 5 ph | 50000 lx |
| 6 ph | 60000 lx |
| 7 ph | 70000 lx |
| 8 ph | 80000 lx |
| 9 ph | 90000 lx |
| 10 ph | 100000 lx |
| 15 ph | 150000 lx |
| 20 ph | 200000 lx |
| 25 ph | 250000 lx |
| 30 ph | 300000 lx |
| 40 ph | 400000 lx |
| 50 ph | 500000 lx |
| 75 ph | 750000 lx |
| 100 ph | 1000000 lx |
π Standard Benchmark Reference Values
CGS illuminance benchmark (1 lumen per square centimeter = 10β΄ lx).
Exact RatioAbout Lux (lx)
The SI coherent derived unit of illuminance and luminous emittance, equal to 1 lumen per square meter (1 lx = 1 lm/mΒ²).
History: Introduced by French physicist RenΓ© Benoist in 1889 and adopted as the international standard unit of illumination by the CIPM in 1948.
Common Uses: Architectural lighting design, workplace lighting standards (OSHA/CIBSE), photography light metering, environmental daylight studies.
About Phot (ph)
A CGS unit of illuminance equal to 1 lumen per square centimeter, or exactly 10,000 lux.
History: Proposed by AndrΓ© Blondel in 1894 as part of the centimeter-gram-second photometric system.
Common Uses: Historical optics literature, high-intensity laboratory photochemical experiments.
β Frequently Asked Questions
How many Phots are in 1 Lux?
There are exactly 0.0001 Phots in 1 Lux (1 lx = 0.0001 ph).
What is the formula to convert Lux to Phot?
The formula is: Phot = Lux / 10000. Since 1 Phot = 10000 Lux, divide the value in Lux by 10000.
How do I convert 1 lx to ph manually?
To convert 1 lx to ph: apply the formula Phot = Lux / 10000. Substituting gives: 1 / 10000 = 0.0001 ph.