Q. The illumination level of a room is 300 lux and the efficacy of the lamps is 60. The Light Power Density (LPD) of the room in Watt/m2 is________ .
A. 1
B. 5
C. 7
D. 11
Ans: 5
Explanation:
Illumination Level of the room = 300 lux = 300 lumen/sq m
Efficacy of the lamps = 60 lumen/watt
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