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

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