Connected load

Planning based on the number of luminaires and illuminance

Connected load

When planning the connected load, the specific luminaire and light source used is taken into consideration to determine the load, or the number of luminaires, required to achieve the specified illuminance. Alternatively, the specified connected load and light source can be used to calculate the average illuminance. The connected load is used in the planning of regular luminaire grids. To estimate the approximate lighting levels, luminaire manufacturers provide tables indicating the illuminances of specified numbers of luminaires.

Connected load

Number of luminaires

The required number of luminaires for a specific illuminance can be calculated on the basis of the connected load values given for a luminaire and 100lx. A further parameter to be included is the maintenance factor to ensure the required illuminance over the entire period of operation. Since the values only apply to a standard room, the calculation for other conditions requires a correction factor.

Connected load

Illuminance

In order to calculate the illuminance of a specified number of luminaires, the designer requires information on the connected load per luminaire per 100lx. The maintained level of illuminance is determined using the maintenance factor. The maintained value is the minimum illuminance level that must be maintained during the operation of the lighting installation. Since these values only apply to a standard room, the calculation for other conditions requires a correction factor.

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