Discussion
A lighting system with 30% of emergent light in downward direction and 70% in upward direction is termed as ______ lighting system.
Answer: B
Lighting systems are classified by the share of the light sent downward and upward: direct lighting sends 90 to 100 percent downward, semi-direct sends 60 to 90 percent downward, general diffused sends about equal amounts both ways, semi-indirect sends 60 to 90 percent upward, and indirect sends 90 to 100 percent upward. A system with 30 percent downward and 70 percent upward is therefore semi-indirect, option (B). The quantity is the upward light output divided by the total, and 70 percent upward is between the semi-indirect limits of 60 and 90 percent.
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