How many footcandles would be measured 3′ above the floor directly below a fixture hung at a height 9′ above the floor?

Given:
An omnidirectional point source light
9,000 candle power (cp)
Ignore reflectance from room surfaces, dirt depreciation, etc

*for this exercise, try utilizing the calculator provided to you on the demonstration exam. To access it, go to the “myNCARB” page, sign in, and click on the “demonstration exam” link on the right-hand column. Click through to the practice exam, the click on “calculator” in the bar near the top.

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