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315H1ans

# 315H1ans - University of Southern California School of...

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University of Southern California Prof. Schiler School of Architecture Spring 2005 Arch 315: Design of the Luminous and Sonic Environment Homework Assignment #1 1.) If a bare bulb gives off 1700 lumens, and you are given that only 30% of the light from the bulb gets to the floor of the room, then what is the resultant illumination level (illuminance) on the floor of a 10' x 10' room? E = F / A F = 1700 lumens x .30 A = 10’ x 10’ = 100 ft 2 E = F / A = (1700 x .3) / 100 = 5.1 footcandles (or lumens/square foot) To convert to lux, multiply by 10.764 lux/fc. E = 5.1fc * 10.764 = 54.8964 or about 55 lux 2.) Will that bulb be a source of glare? Explain. (Imagine looking directly at the bulb. Would the contrast get smaller if the bulb hung down into the middle of the space? Would the contrast be greater or smaller if the walls were painted black?) A single bare bulb is usually a source of glare. If it is right next to the ceiling, it might not be too bad, because the ceiling will be pretty bright all around it. The further the bulb

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