Lighting is provided in Homes, industries, commercial buildings, indoor and outdoor for providing the Comfortable working environment. The primary object of performance measurement is to provide the required lighting effect for the lowest installed load i.e. highest lighting at lowest power consumption.
The purpose of the performance test is to calculate the installed efficiency in terms of lux/watt/m2 for general lighting installation. The calculated value can be compared with the norms for specific types of interior installations for assessing improvement options.
Procedure for measurement of lighting system
To determine the minimum number and positions of measurement points
Room Index = RI = L x W / Hm(L+W)
Where L= length of interior; W = width of the interior; Hm = the mounting height, which is the height of the light fittings above the horizontal working plane. The working plane is usually assumed to be 0.75m above the floor in offices and at 0.85m above floor level in manufacturing areas.
Determination of measurement points
|Room index||Minimum number of measurement points|
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