Answered: A 30 ft by 40 ft classroom with 8 ft…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A 30 ft by 40 ft classroom with 8 ft high ceilings will have an ambient lighting target illuminance of
70 fc at a work plane that is 28 inches above the floor. It is anticipated that the ceiling reflectance
is 0.50 and the average wall reflectance is about 0.3. The space will be illuminated with recessed
lay-in 2 ft x 4 ft open parabolic troffer luminaires with three lamps, as shown in Figure 20.16. The
initial output of the fluorescent lamps is 2850 lumen. The light loss factor will be assumed to be
0.70. Neglecting the spacing criteria, determine the minimum number of luminaires required to
provide uniform illumination in the space. (Type in the number only)

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