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Math In Interior Design

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Haley Harwood

on 1 April 2014

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Transcript of Math In Interior Design

Types of lighting
Sample Problem
Getting started
E = (L)(LLF)(CU) ÷ A
Math In Interior Design:
How to Properly Light A Space

By Haley Harwood
Lighting Uses:
light for mood (attitude) or emotional effect
light for information (work/tasks/finding)

Why is this important?
Proper lighting enables you to perform tasks easily and makes you feel safe and more comfortable
How to PROPERLY light a space using The Lumen Method
Illuminance (E)

Lumens (L)

Light loss factor (LLF) – Industry standard of .85

Coefficient of Utilization (CU):
Spot or Accent – CU = 95% (0.95)
Direct fixture or downlight – CU = 85% (0.85)
Wash or ambient – CU = 75% (0.75)
Indirect fixture – CU = 50% (0.50)

Area (A)
How many downlights are needed if:
Want 45 footcandles
Room 20’ x 30’
650 Lumens/light source
Type of source = Downlights

E = (L)(LLF)(CU) ÷ A

A = 20’ x 30' = 600 sq. ft.

E = (650)(.85)(.85) ÷ 600 sq. ft.

E = .78 footcandles

45 FC ÷ .78 FC = 58 downlights
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