Phot to lux
Type a value in ph to get it in lx instantly.
5,000,000lx
That's 50× as bright as direct sunlight — nothing on our list beats it. Desk work wants about 500 lux; a bright overcast day outdoors is 10,000.
What it means
How bright is that?
These units measure light falling on a surface, not the brightness of a lamp, which is measured in lumens.
The math
How to convert ph to lx
To convert phot to lux, multiply by 10,000.
Example: 500 ph × 10,000 = 5,000,000 lx.
In the other direction, 1 lx = 0.0001 ph.
Every unit
Your light level in every unit
Tables
ph to lx conversion table
| ph | lx |
|---|---|
| 1 ph | 10,000 lx |
| 5 ph | 50,000 lx |
| 10 ph | 100,000 lx |
| 50 ph | 500,000 lx |
| 100 ph | 1,000,000 lx |
| 200 ph | 2,000,000 lx |
| 300 ph | 3,000,000 lx |
| 500 ph | 5,000,000 lx |
| 750 ph | 7,500,000 lx |
| 1,000 ph | 10,000,000 lx |
| 2,000 ph | 20,000,000 lx |
| 5,000 ph | 50,000,000 lx |
| 10,000 ph | 100,000,000 lx |
lx to ph conversion table
| lx | ph |
|---|---|
| 1 lx | 0.0001 ph |
| 5 lx | 0.0005 ph |
| 10 lx | 0.001 ph |
| 50 lx | 0.005 ph |
| 100 lx | 0.01 ph |
| 200 lx | 0.02 ph |
| 300 lx | 0.03 ph |
| 500 lx | 0.05 ph |
| 750 lx | 0.075 ph |
| 1,000 lx | 0.1 ph |
| 2,000 lx | 0.2 ph |
| 5,000 lx | 0.5 ph |
| 10,000 lx | 1 ph |
Quick answers
Quick answers
- How many lx is 1 ph?
- 1 ph is 10,000 lx.
- How many lx is 10 ph?
- 10 ph is 100,000 lx.
- How many lx is 500 ph?
- 500 ph is 5,000,000 lx.
The units
About these units
Phot (ph)
A phot is one lumen per square centimeter: 10,000 lux. It belongs to the old CGS system and is rare today.
Lux (lx)
One lux is one lumen spread over one square meter. It is the SI unit for how much light reaches a surface.
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