For conversion, 1 foot-candle = 10.764 lux. The difference is that the foot-candle uses the Imperial standard measuring system (feet, pounds, etc.), while the lux uses the metric system (meters, grams, etc.).Ī single foot-candle is equivalent to the amount of light that falls on a surface that is one foot away from a single candle, and a lux is the amount of light that falls on a surface one meter away from a candle. The current standard unit of measure to be used is “candela.”įoot-Candles & Lux Foot-candles and lux measure the same thing-the amount of visible light that falls on a surface. One candela is close to the light intensity produced by an ordinary candle as perceived by the human eye, and addresses how bright a light source is in a particular direction.Īlthough the term “candlepower” was once the predominant unit of measure used to describe the intensity of a light, this term is now considered to be obsolete. The key difference between the two is that candela is specifically a measurement of directional intensity. The Effective Lumen output is measured using a photometric testing device and takes into consideration electrical and optical losses, so it is a better representation of the useful visible light that is produced.Read more on how to calculate Effective Lumens here.Ĭandela are similar to lumens in that both deal with light output as perceived by the human eye.
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