1) Illumination unit 
A measure of light useful in determining intensity of light for growing orchids; the illumination produced by a candle at a distance of one foot.
(from the article `optics`) ...of one candle power into a cone having a solid angle of one steradian. When light falls upon a surface it produces illumination (i.e., ... ...in most applications. The zonal cavity method, which takes into account the lamps, fixtures, shape of room, and colours of room surfaces, is one ... [2 related ar...
Illumination or brightness equivalent to 1 lumen per square foot; replaced in the SI system by the candela. ... (05 Mar 2000) ... 
(fc) Footcandles is a unit of measurement of illuminance (how much light is striking a point on a surface). Once footcandle is equivalent to 10.764 lux.
Type: Term Pronunciation: fut′kan-dĕl Definitions: 1. Illumination or brightness equivalent to 1 lumen per square foot; replaced in the SI system by the candela.
A measure of light useful in determining intensity of light for growing orchids; the illumination produced by a candle at a distance of one foot.
[n] - a unit of illuminance on a surface that is everywhere 1 foot from a point source of 1 candle
footcandle, foot candle Illumination or brightness equivalent to one lumen per square foot; replaced in the SI system by the candela; or the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency.