Foot-Candle to Watt per Square Centimeter (at 555 nm) Conversion

Convert between Foot-Candle and Watt per Square Centimeter (at 555 nm) quickly and accurately.

From Foot-Candle

ft*c, fc

To Watt per Square Centimeter (at 555 nm)

W/cm² (at 555 nm)

How to Convert Foot-Candle to Watt per Square Centimeter (at 555 nm)

Conversion Formula

1 ft*c, fc = 0 W/cm² (at 555 nm)

1 W/cm² (at 555 nm) = 634527.763 ft*c, fc

Example

Convert 15 ft*c, fc to W/cm² (at 555 nm):

15 ft*c, fc = 15 × 0 W/cm² (at 555 nm) = 0 W/cm² (at 555 nm)

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

Watt per Square Centimeter (at 555 nm)

W/cm² (at 555 nm)

Definition

The Watt per Square Centimeter (at 555 nm) is a unit of spectral irradiance that can be converted to illuminance at the peak sensitivity wavelength of the human eye. It represents the radiant power per unit area at 555 nm, weighted by the luminous efficacy of radiation.

History/Origin

Developed for converting between radiometric and photometric quantities at the peak sensitivity wavelength of human vision. It provides a bridge between physical light measurements and perceived brightness, using the luminous efficacy of 683 lumens per watt at 555 nm.

Current Use

Used in optical engineering, laser technology, and display characterization where the relationship between radiant power and perceived brightness is important. It allows for precise conversion from physical measurements to photometric quantities for monochromatic light sources.

Multiplier

6830000

Offset