Photometry
noxtoph
Convert nox (nox) to phots (ph).
Factor1 nox = 1e-7 ph
Converter
nox
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ph
Rendered to 6 significant figures.
Formula
Formula
ph = nox × 1e-7
Multiply any value in nox by 1e-7 to obtain the value in phots.
Worked example
Convert 10000 nox to ph.
- 01Start with 10000 nox.
- 02Multiply by the conversion factor: 10000 × 1e-7 = 0.001 ph.
Result10000 nox = 0.001 ph
Conversion table
| nox | ph |
|---|---|
| 1 | 1e-7 |
| 2 | 2e-7 |
| 5 | 5e-7 |
| 10 | 1e-6 |
| 20 | 2e-6 |
| 50 | 5e-6 |
| 100 | 1e-5 |
| 200 | 2e-5 |
| 500 | 5e-5 |
| 1000 | 0.0001 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from nox to ph?
1 nox equals 1e-7 ph. To convert, multiply the value in nox by 1e-7.
How do I convert 1 nox to ph?
1 nox = 1e-7 ph. For any value, multiply by 1e-7.
How do I convert ph back to nox?
Divide by the same factor — or equivalently, multiply by 1e+7. So 1 ph = 1e+7 nox.
When would I need to convert nox to phot?
Illuminance conversions between nox 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).