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Height of lamp from floor level is
5 m
4 m
1 m
Any of these
5 m
In interior lighting design and electrical installation, the mounting height of a lamp from the floor level is determined by the ceiling height, the nature of the application, and the required illumination level. A mounting height of 5 meters is a standard specification for industrial high-bay lighting installations where uniform light distribution is required over a large floor area.
In interior lighting design and electrical installation, the mounting height of a lamp from the floor level is determined by the ceiling height, the nature of the application, and the required illumination level. A mounting height of 5 meters is a standard specification for industrial high-bay lighting installations where uniform light distribution is required over a large floor area.
E=d2Icos╬╕тАЛ тАФ Illumination formula where d is height
h=HcтАЛтИТHwтАЛ тАФ Relationship between ceiling height and working plane height
The illumination at a point is governed by the Inverse Square Law E=d2Icos╬╕тАЛ, where d is the vertical distance between the light source and the work plane. By mounting lamps at a specific height (e.g., 5m), designers optimize the spread of light (theta) and minimize shadows, ensuring the effective utilization of the lamp's luminous flux.
Mounting height directly affects the spacing-to-mounting height ratio (S/H ratio).
Higher mounting positions reduce glare but require lamps with higher intensity for the same lux level at the floor.
Industrial installations often prefer heights between 4m and 6m for effective light spread.
Improved uniformity of light distribution
Reduced direct glare for workers
Increased coverage area per fixture
Higher power consumption required to maintain lux levels at greater distances
Increased difficulty in maintenance and lamp replacement
Industrial workshops
Warehouses
Large manufacturing floors
For residential applications, the height is typically lower (approx 2.5m to 3m).
Option C (1m) is impractical for ceiling lighting as it would cause excessive glare and localized hotspots.
A is correct тАФ 5m is a standard engineering specification for high-bay lighting installations in industrial environments.
Always verify if the question refers to 'Working Plane' (usually 0.75m to 0.9m above floor) or 'Floor Level' when calculating light intensity.