[Solved] In which case artificial lighting is necessary?

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Q.	In which case artificial lighting is necessary?
A.	Where the recommended illumination levels have to be obtained by artificial lighting only.
B.	To supplement day lighting when the level of illumination falls below the recommended value.
C.	Where visual task may demand a higher level of illumination.
D.	all of the above
Answer» D. all of the above

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