![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](https://www.gkseries.com/blog/wp-content/uploads/2023/07/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.jpg)
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
![](https://www.gkseries.com/blog/wp-content/uploads/2023/07/image-90.png)