ACD Blog LED Lighting: What is a Foot Candle & How is it Measured? (Backup)

. What is a foot candle?  You may be wondering, what the heck is a foot candle? Why is this so important? How many foot candles are in my building and how many are required? How do you measure this? Believe it or not, foot candles are the most common unit of measure used by lighting professionals to calculate light levels in businesses and outdoor spaces. In a nutshell, a foot candle is a measurement of light intensity and is defined as the illuminance on a one-square foot surface from a uniform source of light.