What would the average illuminance be if only half of the


Assume that 40% of the light emitted by a 1000 W metal halide lamp (110 000 lumens) illuminates a surface with the area of a 32 ft diameter.

a. Determine the average illuminance of the surface in foot-candles.

b. Determine the average illuminance of the surface in lux.

c. What would the average illuminance be if only half of the light illuminated the surface?

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Mechanical Engineering: What would the average illuminance be if only half of the
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