Convert Phot to Nox
Convert phots to nox by entering a value below.
How to Convert Phots to Nox
The phot and nox are both units of illuminance. By definition, 1 phot equals exactly 10000000 nox. This means to convert phots to nox, you multiply by 10000000.
Formula
Step-by-Step Example
Convert 5 ph to nox:
We need to convert phots to nox
Since 1 ph = 10000000 nx, multiply by 10000000
5 × 10000000 = 50000000
5 ph = 50000000 nx
Phot to Nox Conversion Table
Quick reference table for common phot to nox conversions. Click any value for detailed calculation.
| Phots (ph) | Nox (nx) |
|---|---|
| 0.1 ph | 1000000 nx |
| 0.5 ph | 5000000 nx |
| 1 ph | 10000000 nx |
| 2 ph | 20000000 nx |
| 5 ph | 50000000 nx |
| 10 ph | 100000000 nx |
| 25 ph | 250000000 nx |
| 50 ph | 500000000 nx |
| 100 ph | 1000000000 nx |
About These Units
Phot (ph)
The phot (ph) is the CGS unit of illuminance equal to 10,000 lux or 1 lumen per square centimeter. Very bright: full sunlight is about 10 phots. Found in older scientific literature. One phot = 929 foot-candles. Largely replaced by lux in modern usage.
Nox (nx)
The nox (nx) equals 1 millilux (0.001 lux). Used in scotopic (low-light) vision research, astronomy, and light pollution studies. Full moon: 100-300 nox. Starlight: 0.1-1 nox. Quarter moon: 10-50 nox. Measures illumination at the threshold of human vision.
Frequently Asked Questions
How do I convert phots to nox?
To convert phots to nox, multiply the value by 10000000. For example, 10 ph = 100000000 nx.
How many nox are in 1 phot?
1 phot equals 10000000 nox.
What is the formula for phots to nox?
The formula is: nx = ph × 10000000.