NCQLP LC Practice Questions - NCQLP Lighting Certified (LC) Exam

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A point source produces 25 footcandles on a surface 4 ft directly below it. Using the inverse-square law, what is the illuminance at a point 8 ft directly below the same source?

100 footcandles 6.25 footcandles 12.5 footcandles 50 footcandles

Correct Answer:

6.25 footcandles

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