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Convert Phot to Lux

Use this free converter to change phot (ph) into lux (lx). Phot and lux both measure illuminance. As a quick reference, 1 ph equals 10000 lx, and 1 lx equals 0.0001 ph.

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Lux (lx)
10000

1 ph = 10000 lx

Illuminance conversion table

PhotLux
0.01100
0.11000
0.55000
110000
220000
330000
550000
10100000
20200000
25250000
50500000
1001000000
1,00010000000

How to convert Phot to Lux

Multiply the phot value by 10000 to get lux.

  1. Enter the number of phot you want to convert.
  2. The converter instantly shows the equivalent value in lux.
  3. Worked example: 15 ph × 10000 = 150000 lx.
  4. Use the swap button to reverse the conversion (lux to phot).

About these units

Phot (ph)

Definition
A phot (ph) is a CGS unit of illuminance equal to 10,000 lux, or one lumen per square centimeter.
History
It was part of the CGS system, predating the SI, and is now largely obsolete.
Current use
The phot is rarely used today, appearing only in older technical literature.

Lux (lx)

Definition
The lux (lx) is the SI unit of illuminance, equal to one lumen per square meter — a measure of how much light falls on a surface.
History
It was adopted as an SI unit in 1960, derived from the lumen and the meter.
Current use
Lux is used in lighting design, photography, agriculture (grow-light intensity), and workplace health and safety standards.

Frequently asked questions

How many lux are in a phot?

There are 10000 lx in 1 ph. To convert, multiply the number of phot by 10000.

How do I convert phot to lux?

Multiply the phot value by 10000 to get lux. For example, 10 ph = 100000 lx.

Is this phot-to-lux converter free?

Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.

Convert Phot to other illuminance units

Unit1 Phot equals
Lux (lx)10000 lx
Millilux (mlx)10000000 mlx
Kilolux (klx)10 klx
Foot-candle (fc)929.0304 fc
Nox (nx)10000000 nx

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