Foot-Candle to Phot Conversion

Convert between Foot-Candle and Phot quickly and accurately.

From Foot-Candle

ft*c, fc

To Phot

How to Convert Foot-Candle to Phot

Conversion Formula

1 ft*c, fc = 0.001 ph

1 ph = 929.03 ft*c, fc

Example

Convert 15 ft*c, fc to ph:

15 ft*c, fc = 15 × 0.001 ph = 0.016 ph

Unit Information

Learn about the illumination units you're converting between

Foot-Candle

ft*c, fc

Definition

The Foot-Candle is an imperial unit of illuminance, representing the illuminance produced by a standard candle at a distance of one foot. It is equivalent to approximately 10.76 lux and is commonly used in countries that employ the imperial system for lighting measurements.

History/Origin

Developed in the United States and other countries using imperial units as a practical measure of illumination. It was based on the light output of a standard candle at a distance of one foot, providing an intuitive reference for lighting levels in everyday applications.

Current Use

Still widely used in the United States for architectural lighting, workplace safety standards, and general lighting applications. It provides a familiar unit for lighting professionals and is commonly referenced in building codes and lighting specifications.

Multiplier

10.764

Offset

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