foot-candle

詳細解釋：

foot-can.dle

n.Abbr. fc,ft-c（名詞）縮寫 fc,ft-c
A unit of measure of the intensity of light falling on a surface, equal to one lumen per square foot and originally defined with reference to a standardized candle burning at one foot from a given surface.
英尺燭光：用在衡量光照在物體表面強度的單位，相當於每平方英尺一流明，最初是參照一支標準蠟燭在距給定平面一英尺處燃燒而定義的