Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Nox to Phot
Convert nx to ph instantly, then review the formula, assumptions, and rounding guidance.
Light & sound unitsInstant result
Decimals
Formula result = input × 0.001 ÷ 10000. 1 nx = 0 ph
Common examples
One value, several units
Lux0.001 lx
Foot-candles0.0001 fc
Phot0 ph
Conversion table
| nx | ph |
|---|---|
| 1 nx | 0 ph |
| 2 nx | 0 ph |
| 5 nx | 0 ph |
| 10 nx | 0 ph |
| 25 nx | 0 ph |
| 50 nx | 0 ph |
| 100 nx | 0 ph |
Conversion chart
1 nx0 ph
5 nx0 ph
10 nx0 ph
25 nx0 ph
50 nx0 ph
Worked example
1 foot-candle equals approximately 10.7639 lux.
Unit definition
Nox (nx) One nox equals 0.001 lux.
Unit history
Nox is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert nx to lux.
3. Convert the base value to ph and apply your display precision.
Understand the result before using it
Nox to Phot converts a value measured in Nox (nx) into the equivalent value in Phot (ph). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 0.001 ÷ 10000
Assumptions
- Nox and Phot represent the same illuminance quantity.
- The input is expressed in nx; the output is expressed in ph.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 nx = 0.0000001 ph. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a nx measurement in a document that expects ph.
- Compare a nox value with a value reported in phot.
- Check the nx-to-ph arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Decibel sound-pressure level is logarithmic and depends on the stated reference pressure.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Nox to Phot?
result = input × 0.001 ÷ 10000 Using the displayed relationship, 1 nx equals 0.0000001 ph.
How many Phot are in one Nox?
One Nox is 0.0000001 Phot. The displayed digits may be rounded.
Can I reverse the nx to ph conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts ph back to nx.
Is the Nox to Phot result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.