Photometry
lxtoph
Convert lux (lx) to phots (ph).
Factor1 lx = 0.0001 ph
Converter
lx
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ph
Rendered to 6 significant figures.
Formula
Formula
ph = lx × 0.0001
Multiply any value in lux by 0.0001 to obtain the value in phots.
Worked example
Convert 10000 lx to ph.
- 01Start with 10000 lx.
- 02Multiply by the conversion factor: 10000 × 0.0001 = 1 ph.
Result10000 lx = 1 ph
Conversion table
| lx | ph |
|---|---|
| 1 | 0.0001 |
| 2 | 0.0002 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 20 | 0.002 |
| 50 | 0.005 |
| 100 | 0.01 |
| 200 | 0.02 |
| 500 | 0.05 |
| 1000 | 0.1 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from lx to ph?
1 lx equals 0.0001 ph. To convert, multiply the value in lux by 0.0001.
How do I convert 1 lx to ph?
1 lx = 0.0001 ph. For any value, multiply by 0.0001.
How do I convert ph back to lx?
Divide by the same factor — or equivalently, multiply by 10000. So 1 ph = 10000 lx.
When would I need to convert lux to phot?
Illuminance conversions between lx and ph 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).