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The word “foot” is used to refer not to body parts but to distance: a foot-candle is the illuminance of a one-candela light source per square foot, measured from one foot away. It is used in photography and film, as well as in some other areas. A foot-candle is a non-metric unit for measuring illuminance. One of the most common units for measuring Illuminance is a lux. This is one of the reasons why the word 'brightness' is not widely used in science. We could also think of the area as being bright, or the object as being bright, or the light source as being bright. It could also be a combination of some or all of these, depending on the situation. Our perception of brightness can be either the perception of the light reflected from the surface (luminance), or light going to the surface (illuminance), or even the total amount of light in the room. Illuminance = ILluminance = Incident Light + luminance. It is easy to remember it if you think that: This is different from luminance, which is the amount of light reflected from the surface. One can think of illuminance as the light that is going towards the object, or in particular the amount of light, just as it touches the surface. The Difference Between Illuminance, Luminance, and Brightness

This means that for the same light source illuminance would be greater for a smaller area, and smaller for a greater area. Illuminance is inversely proportional to the area over which the light is scattered. Illuminance is often likened to how bright an object appears to the human eye. Illuminance calculations are adjusted for each wavelength because humans perceive the light of a wavelength of about 550 nanometers (green) and close to it (yellow and orange) as brighter, while the light of longer or shorter wavelengths (purple, blue, red) as darker. This value depends on the human perception of the brightness of the light of different wavelengths, corresponding to different colors.

Illuminance is a measure of the amount of light that shines on a given unit of area of an object’s surface. Relationship between EV and lighting conditions Illuminance in Photography and Videography

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