Measuring
Light
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The light
output of a source is
measured in lumens (lm) and
the intensity of light
(luminous intensity) in a
given direction is measured
in candelas (cd). When light
strikes a surface it is
measured in footcandles (fc),
one footcandle being the
illumination on a surface
one foot away from a
standard candle (or one
lumen per square foot).
This process of light
striking a surface is
referred to as illuminance.
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