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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 _________.
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- 1
- 5
- 7
- 11
Correct Option: B
Illumination Level of the room = 300 lux = 300 lumen/sq m
Efficacy of the lamps = 60 lumen/watt
| LPD = | = | = 5 Watt / sq m | ||
| Efficacy | 60 |
