Phots to Lux
Type a value in Phots and get the result in Lux, calculated exactly.
500 Phots = 5,000,000 Lux
Precision
Exact factorThis result is exact.
Slide rule
Drag to scrub · arrow keys step · Shift × 10Paper tape
ConvertThemAll
- Your conversions print here.
0 lines · kept on this device only
Formula
lx = ph × 10,000
To convert Phots to Lux, multiply the value by 10,000.
Worked examples
- 1 ph × 10,000 = 10,000 lx
- 500 ph × 10,000 = 5,000,000 lx
- 100 ph × 10,000 = 1,000,000 lx
This factor is exact by definition.
Conversion table
| Phots (ph) | Lux (lx) |
|---|---|
| 1 | 10,000 |
| 2 | 20,000 |
| 3 | 30,000 |
| 4 | 40,000 |
| 5 | 50,000 |
| 6 | 60,000 |
| 7 | 70,000 |
| 8 | 80,000 |
| 9 | 90,000 |
| 10 | 100,000 |
| 15 | 150,000 |
| 20 | 200,000 |
| 25 | 250,000 |
| 30 | 300,000 |
| 40 | 400,000 |
| 50 | 500,000 |
| 60 | 600,000 |
| 70 | 700,000 |
| 75 | 750,000 |
| 80 | 800,000 |
| 90 | 900,000 |
| 100 | 1,000,000 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Lux to Phots
| Lux (lx) | Phots (ph) |
|---|---|
| 1 | 0.0001 |
| 2 | 0.0002 |
| 3 | 0.0003 |
| 4 | 0.0004 |
| 5 | 0.0005 |
| 6 | 0.0006 |
| 7 | 0.0007 |
| 8 | 0.0008 |
| 9 | 0.0009 |
| 10 | 0.001 |
| 15 | 0.0015 |
| 20 | 0.002 |
| 25 | 0.0025 |
| 30 | 0.003 |
| 40 | 0.004 |
| 50 | 0.005 |
| 60 | 0.006 |
| 70 | 0.007 |
| 75 | 0.0075 |
| 80 | 0.008 |
| 90 | 0.009 |
| 100 | 0.01 |
Unit definitions
- Phots ph
- The CGS unit: one lumen per square centimetre, exactly 10 000 lux.
- Lux lx
- The SI unit of illuminance: one lumen per square metre.
Questions people ask
Phots to Lux: what is the conversion factor?
One ph is 10,000 lx.
How do I convert Phots to Lux?
Use the formula above. For example, 500 ph = 5,000,000 lx.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.