Convert phot to lux

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Phot

The phot (ph) is the CGS unit of illuminance. One phot equals 10,000 lux (one lumen per square centimetre). It was widely used before the adoption of the SI system and is still encountered in older scientific literature and some specialised applications. 


Lux

The lux (lx) is the SI unit of illuminance, measuring luminous flux per unit area. One lux equals one lumen per square metre. It is used to measure the intensity of light as perceived by the human eye falling on a surface. Typical office lighting is around 300–500 lux, while direct sunlight exceeds 100,000 lux. 


Phot to Lux conversion table
PhotLuxLuxPhot
11000010.0001
22000020.0002
33000030.0003
55000050.0005
10100000100.001
20200000200.002
25250000250.0025
50500000500.005
1001E+061000.01
2502.5E+062500.025
5005E+065000.05
10001E+0710000.1
How to convert Phot to Lux

1 ph = 10000 lx. To convert any value, multiply it by 10000. For example, 25 ph = 250000 lx.

Frequently asked questions
How many lx are there in one ph?
One ph is equal to 10000 lx.
How do you convert Phot to Lux?
Multiply the value in Phot by 10000 to get the result in Lux.
How much is 25 ph in lx?
25 ph is equal to 250000 lx.
How do you convert Lux back to Phot?
Divide by the same factor: multiply the value in Lux by 0.0001 to get Phot.

Most common illumination unit conversions