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Illumination System Considerations

ILLUMINANCE: (old term: ILLUMINATION)

Definition: (density of luminous flux on a surface)
Symbol: E
Unit: Footcandle (fc) = (1 lumen per sq. foot)
Unit: Lux (lx) = (1 lumen per sq. meter)

EQUATIONS

         Candela                                          Lamp Lumens
FC =  ------------------------                 FC = -----------------
        Distance square (ft.)                           Area (sq.ft)

                                                      
         Candela                                          Lamp Lumens
LUX = ------------------------                LUX = ----------------
         Distance square (m.)                         Area (sq. m.)
                                  

CONVERSIONS

FC = Lux x .0929

LUX = FC x 10.76 - (ie: 550 FC = 5918 LUX)

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Last modified: April 14, 2012