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References
1.IES Lighting Handbook , Fifth Edition .
2.NFPA No. 101 , 1973 , Life Safety Code.
3.
Scharf
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, “The changing market ,” LD&A , May 1974 , pp. 21 .
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“What's new in ac systems ,” LD&A , May 1975 , p. 37 –38 .
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