Foot Candle

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Foot Candle </dt>
A unit of illuminance, incident light, or illumination equal to 1 lumen per square foot. This is the illuminance provided by a light source of one candle at a distance of 1 foot, hence the name. Compare lux, phot. </dd>
''Full sunlight with zenith sun produces an illuminance of the order of 10,000 foot-candles on a horizontal surface at the earth's surface. Full moonlight provides an illuminance of only about 0.02 foot-candle also at earth's surface. Adequate illumination for steady reading is taken to be about 10 foot-candles; that for close machine work is about 30 to 40 foot-candles. [[/a>|/a> ]]</dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use