I'm reading a scientific journal. They ae expressing light intensity as ft-c. For example-?

"The light intensity was decreased from 10 ft-c to .5 ft-c" What doest that mean?

I'm reading a scientific journal. They ae expressing light intensity as ft-c. For example-?
It's called a foot-candle





Wikipedia has the definition





http://en.wikipedia.org/wiki/Foot-candle
Reply:ft-c = foot candles. 1 lumen per square foot





lux - 1 lumen per square meter


1 foot-candle = 10.76 lux





does that help? It is a measure of the amount of luminance.
Reply:ft-c = foot-candles, a rather old definition the measurement of light. It can be related to Watt by:





1 lux = 10.76 ft-c





1 lux = 1 lumen (lm)/m^2 = 638 W/m^2





1 ft-c = 59.59 W/m^2
Reply:ft-c. = foot-candle. The intensity of a standard candle at a distance of 1 foot. One footcandle is equal to 10.76 lux (SI unit).





An overcast day will produce an intensity of around 1,000 ft-c. About 30 foot-candles of light are recommended for computer workstations.