The luminous efficiency of a sodium vapour lamp is: – McqOptions

MCQOPTIONS

1.	The luminous efficiency of a sodium vapour lamp is:
A.	40-50 lumens/W
B.	50-100 lumens/W
C.	120-200 lumens/W
D.	10-12 lumens/W
Answer» D. 10-12 lumens/W

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