Direction: A room of size 100 m2 is illuminated by 10 lamps of 40 W having a luminous efficacy of 50 lm/W.
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If utilization factor is 0.5, at a working height of 90 cm above the floor level, the illumination in lux would be
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- 100
- 200
- 500
- 1000
Correct Option: A
Luminous Flux (F) = 20,000 lux
Area (A) = 100 sqm
Utilization Factor (UF) = 0.5
Maintenance Factor (M) = 1 (on assumption)
| Illution = | = | = 100 lux | ||
| A | 100 |
