How to convert lux to phots
ph = lx × 0.0001Multiply the value in lux by 0.0001. To go the other way, multiply by 10,000 (or divide by 0.0001).
A lux is smaller than a phot: it takes 10,000 lux to make one phot.
Worked examples
- 1 lux1 lx × 0.0001 = 0.0001 ph
- 5 lux5 lx × 0.0001 = 0.0005 ph
- 10 lux10 lx × 0.0001 = 0.001 ph
- 20 lux20 lx × 0.0001 = 0.002 ph
- 100 lux100 lx × 0.0001 = 0.01 ph
Lux to phots conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Lux (lx) | Phots (ph) |
|---|---|
| 0.1 lx | 0.00001 ph |
| 0.25 lx | 0.000025 ph |
| 0.5 lx | 0.00005 ph |
| 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 |
| Lux (lx) | Phots (ph) |
|---|---|
| 12 lx | 0.0012 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 |
| 250 lx | 0.025 ph |
| 500 lx | 0.05 ph |
| 1,000 lx | 0.1 ph |
About the units
Lux (lx)
One lumen per square metre.
Phot (ph)
The phot (ph) is a unit of illuminance in the centimetre–gram–second (CGS) system. One phot equals 10,000 lux (lx).
Frequently asked questions
How many phots are in one lux?
There are 0.0001 phots in one lux, and this value is exact by definition.
How do I convert lux to phots?
Multiply the number of lux by 0.0001. For example, 10 lx × 0.0001 = 0.001 ph.
How many lux are in one phot?
One phot equals 10,000 lux. That is the reverse factor, 1 ÷ 0.0001.
What is 10 lux in phots?
10 lx = 0.001 ph.
Is this lx to ph converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.