The unit of measuring the brightness - or to use the
precise scientific terminology, illuminance - in SI system of measurement is lux or
lumen per square meter. Illuminance is measured in foot candles. One foot-candle is
equal to 10.76 lux.
Please note that lumen is the measure
of total light emitted by a source of light. While the lux is the intensity of light
received by a surface. The illuminance of a surface from a given source of light is
inversely proportional to the distance of the surface from the source. Thus, as we move
away from a given source of light the illuminance from that source is proportion to
square of the total distance.
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