Photometry
phtolx
Convert phots (ph) to lux (lx).
Factor1 ph = 10000 lx
Converter
ph
Accepts numbers or expressions, e.g. 150 + 14.7
Result
lx
Rendered to 6 significant figures.
Formula
Formula
lx = ph × 10000
Multiply any value in phots by 10000 to obtain the value in lux.
Worked example
Convert 1 ph to lx.
- 01Start with 1 ph.
- 02Multiply by the conversion factor: 1 × 10000 = 10000 lx.
Result1 ph = 10000 lx
Conversion table
| ph | lx |
|---|---|
| 1 | 10000 |
| 2 | 20000 |
| 5 | 50000 |
| 10 | 1.0000e+5 |
| 20 | 2.0000e+5 |
| 50 | 5.0000e+5 |
| 100 | 1.0000e+6 |
| 200 | 2.0000e+6 |
| 500 | 5.0000e+6 |
| 1000 | 1e+7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from ph to lx?
1 ph equals 10000 lx. To convert, multiply the value in phots by 10000.
How do I convert 1 ph to lx?
1 ph = 10000 lx. For any value, multiply by 10000.
How do I convert lx back to ph?
Divide by the same factor — or equivalently, multiply by 0.0001. So 1 lx = 0.0001 ph.
When would I need to convert phot to lux?
Illuminance conversions between ph and lx are used in lighting design, workplace safety assessments, and photographic exposure work. Lux is the SI standard for international codes; foot-candles remain common in US lighting specifications.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).