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Light Converters

Illumination Converter

Result

... Lumen per square meter = ... Phot

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Lumen per square meter to Phot Converter

Use this page to convert lumen per square meter values into phot, with background details, formulas, a worked example, and a quick conversion table.

Conversion formula

1 lm/m^2 = 0.0001 ph

1 ph = 10,000 lm/m^2

Example: 500 lm/m^2 = 0.05 ph

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Lumen per square meter

One lumen per square meter is equal to one lux.

History: Lux is defined as lumen per square meter.

Current use: Used for direct illumination calculations and lighting design.

Also written as lm/m^2.

Phot

One phot is equal to 10000 lux.

History: The phot is a CGS photometric unit equal to one lumen per square centimeter.

Current use: Used mainly in older photometric tables and reference conversions.

Also written as ph.

Lumen per square meter to Phot table

Lumen per square meter [lm/m^2]Phot [ph]
0.01 lm/m^20.000001 ph
0.1 lm/m^20.00001 ph
1 lm/m^20.0001 ph
2 lm/m^20.0002 ph
5 lm/m^20.0005 ph
10 lm/m^20.001 ph
20 lm/m^20.002 ph
50 lm/m^20.005 ph
100 lm/m^20.01 ph

Frequently asked questions

  • How many Phot (ph) are in one Lumen per square meter (lm/m^2)?

    One Lumen per square meter equals 0.0001 Phot.

  • How do you convert Lumen per square meter to Phot?

    Multiply the Lumen per square meter value by 0.0001 to get the result in Phot.

  • How do you convert Phot back to Lumen per square meter?

    Multiply the Phot value by 10,000 to get back to Lumen per square meter.

  • What is 500 Lumen per square meter in Phot?

    500 Lumen per square meter equals 0.05 Phot.