Footcandle
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Switch R to fc
Footcandle Unit Table
A list of units symbol and data.
From fcTo RAll conversion
1 fc10.7639 R
2 fc21.5278 R
3 fc32.2917 R
4 fc43.0556 R
5 fc53.8195 R
6 fc64.5834 R
7 fc75.34729999999999 R
8 fc86.1112 R
9 fc96.8751 R
10 fc107.639 R
Description

Footcandle (fc): Imperial Unit of Illuminance

The footcandle is a non-SI unit of illuminance used primarily in the United States. It is defined as the illuminance on a one-square-foot surface from a uniform source of light equivalent to one lumen. One footcandle equals approximately 10.764 lux. Despite the global shift towards SI units, the footcandle remains prevalent in certain industries and applications.

Understanding footcandles is important for professionals working in lighting design, architecture, and photography within regions that use imperial measurements. It allows for the assessment and specification of lighting requirements, ensuring that spaces are adequately illuminated according to established standards and practices.

Rayleigh (R): Specialized Unit for Atmospheric Light Emissions

The rayleigh is a non-SI unit used to measure the faint emissions of light in the upper atmosphere, such as those produced by auroras or airglow. One rayleigh corresponds to 1010 photons per square meter per second along a vertical column. This unit is especially important in geophysics, atmospheric science, and astrophysics for quantifying extremely low levels of light that are invisible to the human eye but detectable by scientific instruments.

Rayleigh measurements are essential for studying natural light phenomena in the Earth's mesosphere and thermosphere. These emissions play a crucial role in understanding the impact of solar activity on Earth, helping scientists monitor space weather and its effects on satellite communications and navigation systems. By quantifying these subtle luminous occurrences, the rayleigh contributes to our broader understanding of planetary atmospheres and cosmic interactions.

Complete list of conversion for Footcandle
Footcandle (fc)

1 Footcandle = 10.7639 Candela

Convert 2 fc → cd

1 Footcandle = 10.7639 Candlepower

Convert 2 fc → cp

1 Footcandle = 10.7639 Lumen

Convert 2 fc → lm

1 Footcandle = 10.7639 Lux

Convert 2 fc → lx

1 Footcandle = 0.00107639 Phot

Convert 2 fc → ph

1 Footcandle = 10.7639 Candela per square meter

Convert 2 fc → cd/m²

1 Footcandle = 10.7639 Nit

Convert 2 fc → nt

1 Footcandle = 0.00107639 Stilb

Convert 2 fc → sb

1 Footcandle = 0.0033815789163952935 Lambert

Convert 2 fc → L

1 Footcandle = 3.1415896129980365 Footlambert

Convert 2 fc → fL

1 Footcandle = 10.7639 Lumen second

Convert 2 fc → lm·s

1 Footcandle = 10.7639 Lux second

Convert 2 fc → lx·s

1 Footcandle = 10.7639 Rayleigh

Convert 2 fc → R