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An average lighting level for multi-storied building is
5000 lux
500 lux
700 lux
7000 lux
500 lux
The average illumination level recommended for general office areas and multi-storied building interiors is typically around 500 lux. This value ensures adequate visibility for tasks such as reading and writing while maintaining energy efficiency in accordance with national lighting standards (IS 3646).
The average illumination level recommended for general office areas and multi-storied building interiors is typically around 500 lux. This value ensures adequate visibility for tasks such as reading and writing while maintaining energy efficiency in accordance with national lighting standards (IS 3646).
E=A╬жтАЛ тАФ Basic formula for average illumination
E=AN├Ч╬ж├ЧUF├ЧMFтАЛ тАФ Lumen method for interior design
Illumination level (E) is defined as the luminous flux incident per unit area. It is governed by the Inverse Square Law and Lambert's Cosine Law. For interior lighting design, the number of luminaires required is calculated using the Lumen method: E=AN├Ч╬ж├ЧUF├ЧMFтАЛ, where N is the number of lamps, ╬ж is the luminous flux, UF is the Utilization Factor, and MF is the Maintenance Factor.
500 lux is the standard for general office activities.
Higher levels (up to 750-1000 lux) are used for precision work.
Lower levels (100-200 lux) are used for circulation areas like corridors.
Illumination levels are mandated by the Bureau of Indian Standards (BIS).
Reduces eye strain for building occupants
Improves productivity in office environments
Optimizes electricity consumption through proper lamp placement
Excessive lux levels lead to glare and energy wastage
Insufficient levels can cause headaches and fatigue
General Office areas
Commercial multi-storied building interior spaces
Academic reading rooms
IS 3646 provides detailed codes for interior illumination design.
Option A (5000 lux) is extremely high, usually reserved for surgical theaters or specialized visual tasks.
Option C and D (700 and 7000 lux) are generally not the standard design basis for average multi-storied building utility.
B is correct тАФ 500 lux is the standard recommended average illumination level for general office and working areas in a multi-storied building.
Remember that illumination levels scale with the precision of work: 150 lux for circulation, 500 lux for general office work, and 1000+ lux for drafting or precision engineering tasks.