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DEFINITIONS, CALCULATIONS, AND CONVERSIONS
Illuminance:
density of luminous flux on a surface
Symbol: E
Unit: Foot-candle (fc) = (1 lumen per sq. foot)
Unit: Lux (lx) = (1 lumen per sq. meter)
Equations
| Candela | |
| FC = | -------------------- |
| Distance square (ft.) |
| Lamp Lumens | |
| FC = | -------------------- |
| Area (sq.ft) |
| Candela | |
| LUX = | -------------------- |
| Distance square (m.) |
| Lamp Lumens | |
| LUX = | -------------------- |
| Area (sq. m.) |
Conversions
FC = Lux * .0929
LUX = FC * 10.76 - (i.e.: 50 FC = 538 LUX)
