Foot-candle is defined as the amount of illuminance equal to how many lumens per square foot?

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Study for the PMT 103A Industrial Hygiene Test. Get ready with flashcards, multiple choice questions, hints, and explanations to excel in your exam!

Multiple Choice

Foot-candle is defined as the amount of illuminance equal to how many lumens per square foot?

Explanation:
Foot-candle is a measure of illuminance defined as the amount of luminous flux (lumens) spread over a square foot of area. By definition, if one lumen falls on each square foot, the surface has an illuminance of one foot-candle. So the correct value is 1 lumen per square foot. If you had ten lumens on the same area, that would be ten foot-candles; if you had 0.1 lumen per square foot, that would be 0.1 foot-candle, and so on. The key idea is that foot-candle = lumens per square foot.

Foot-candle is a measure of illuminance defined as the amount of luminous flux (lumens) spread over a square foot of area. By definition, if one lumen falls on each square foot, the surface has an illuminance of one foot-candle. So the correct value is 1 lumen per square foot. If you had ten lumens on the same area, that would be ten foot-candles; if you had 0.1 lumen per square foot, that would be 0.1 foot-candle, and so on. The key idea is that foot-candle = lumens per square foot.

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