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    Construction & Electrical

    Lighting Quantity and Average Illuminance Calculator

    Estimate the number of luminaires needed using a transparent lumen-method approximation. Enter area, maintained target illuminance, actual output lumens of two fixture options, utilization factor and maintenance factor, then compare required quantities, estimated lux and total watts.

    MAKE IT SIMPLE
    Calculation details and limitations

    Simple lumen method, not a photometric uniformity or glare simulation. Enter actual fixture lumens and use verified UF/MF.

    Result

    Worked examples

    100 m², 300 lx, 15,000 lm, UF 0.6, MF 0.8

    5 fittings; estimated average 360 lx

    Estimate the number of luminaires needed using a transparent lumen-method approximation. Enter area, maintained target illuminance, actual output lumens of two fixture options, utilization factor and maintenance factor, then compare required quantities, estimated lux and total watts.

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