Watt per Square Centimeter (at 555 nm) to Foot-Candle Conversion
Convert between Watt per Square Centimeter (at 555 nm) and Foot-Candle quickly and accurately.
How to Convert Watt per Square Centimeter (at 555 nm) to Foot-Candle
Conversion Formula
Example
Convert 15 W/cm² (at 555 nm) to ft*c, fc:
Unit Information
Learn about the illumination units you're converting between
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
0
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
0
Watt per Square Centimeter (at 555 nm) to Foot-Candle Conversion Table
| Watt per Square Centimeter (at 555 nm) [W/cm² (at 555 nm)] | Foot-Candle [ft*c, fc] |
|---|---|
| 1 W/cm² (at 555 nm) | 634527.7632010001 ft*c, fc |
| 10 W/cm² (at 555 nm) | 6345277.6320059998 ft*c, fc |
| 25 W/cm² (at 555 nm) | 15863194.0800139997 ft*c, fc |
| 50 W/cm² (at 555 nm) | 31726388.1600290015 ft*c, fc |
| 100 W/cm² (at 555 nm) | 63452776.3200569972 ft*c, fc |
| 0 W/cm² (at 555 nm) | 0E+0 ft*c, fc |
| -10 W/cm² (at 555 nm) | -6345277.6320059998 ft*c, fc |
| -40 W/cm² (at 555 nm) | -25381110.5280230008 ft*c, fc |
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