Phot to Lumen per Square Meter Conversion

Convert between Phot and Lumen per Square Meter quickly and accurately.

From Phot

To Lumen per Square Meter

lm/m²

How to Convert Phot to Lumen per Square Meter

Conversion Formula

1 ph = 10000 lm/m²

1 lm/m² = 0 ph

Example

Convert 15 ph to lm/m²:

15 ph = 15 × 10000 lm/m² = 150000 lm/m²

Unit Information

Learn about the illumination units you're converting between

Phot

Definition

The Phot is a CGS unit of illuminance equal to 10,000 lux, representing one lumen per square centimeter. It is a larger unit used for measuring very high levels of illumination, particularly in scientific and technical applications where high light intensities are common.

History/Origin

Developed as part of the CGS system of units, where the phot provided a convenient way to express high illumination values. It was widely used in scientific literature and technical applications before the adoption of SI units became standard practice.

Current Use

Primarily found in older scientific literature and specialized technical applications. It provides a practical scale for measuring very bright light sources and is still occasionally referenced in photometric research and historical technical documents.

Multiplier

10000

Offset

Lumen per Square Meter

lm/m²

Definition

The Lumen per Square Meter is a unit of illuminance that is numerically equivalent to the lux. It represents the luminous flux per unit area, emphasizing the flux aspect of light measurement and providing a direct relationship between light output and surface illumination.

History/Origin

Derived from the fundamental definition of the lux as one lumen per square meter. It provides an alternative way to express illuminance that emphasizes the luminous flux component, making it useful in calculations involving light sources and their output.

Current Use

Widely used in lighting calculations and photometric applications where the relationship between luminous flux and surface area is important. It provides a practical way to understand illuminance in terms of light source output and surface coverage.

Multiplier

Offset