You define the target.
The target lux level must come from your brief, requirements and the standards applicable to the project.
Specifier tools / Preliminary sizing
An initial estimate, before the photometric study.
Calculate an indicative number of luminaires using your own assumptions. The method is deliberately transparent: no illuminance level, factor or product is selected for you.
You provide the factors.
Utilisation and maintenance factors depend on the room, optics, surfaces and operating conditions.
Then validate through photometry.
Light distribution, layout, uniformity and glare require an appropriate photometric calculation.
Preliminary sizing
Estimate the number of luminaires.
Enter your own assumptions. The result uses only the lumen method and does not replace a photometric study or checks on uniformity, glare or compliance.
The result will appear here once all assumptions have been entered.
What the tool calculates.
The estimate starts from the area and target illuminance to determine the required luminous flux, then adjusts that flux using the utilisation and maintenance factors entered. The number of luminaires is rounded up to the next whole number based on the specified unit luminous flux.
This calculation does not know the luminaire's photometric curve, height or layout. It therefore cannot demonstrate uniformity, UGR, compliance with a standard or the suitability of a specific reference.
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