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Lighting Calculation 20

The Lumen Method calculates average illuminance (E) by taking the initial bare lamp luminous flux (F) multiplied by the number of lamps per luminaire (n), number of luminaires (N), utilization factor (UF), and maintenance factor (MF), divided by the area of the surface (A) to be illuminated. It is used to determine average illuminance based on various lighting design factors.

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Ratana Kem
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1K views1 page

Lighting Calculation 20

The Lumen Method calculates average illuminance (E) by taking the initial bare lamp luminous flux (F) multiplied by the number of lamps per luminaire (n), number of luminaires (N), utilization factor (UF), and maintenance factor (MF), divided by the area of the surface (A) to be illuminated. It is used to determine average illuminance based on various lighting design factors.

Uploaded by

Ratana Kem
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Lumen Method

• Lumen Method: average illuminance (E) is


F × n × N × UF × MF
E=
A
• F = initial bare lamp luminous flux (lumens)
• n = number of lamps per luminaire
• N = number of luminaires
• UF = utilisation factor
• MF = maintenance factor
• A = area of the surface (m2)

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