FOOTCANDLE LIGHT GUIDE - Lighting Design Lab
FOOT CANDLE LIGHT
Guide
FOOTCANDLE LIGHT GUIDE
Footcandles are the most common unit of measure used by lighting professionals to calculate light levels in businesses and outdoor spaces. A footcandle is de ned as the illuminance on a one square foot surface from a uniform source of light. The Illuminating Engineering Society (IES) recommends the following footcandle levels to ensure adequate illumination and safety for occupants. Below is a guideline for common areas to assist in achieving appropriate light levels with the greatest energy-e ciency.
Building Area & Task
WAREHOUSING & STORAGE Bulky Items--Large Labels Small Items--Small Labels Cold Storage Open Warehouse Warehouse w/Aisles COMMERCIAL OFFICE Open Office
Average Maintained Footcandles (Horizontal) (FC)
10 30 20 20 20
40
Private Office
40
Conference Room
30
Range of Maintained Footcandles (Horizontal) (FC)
10 - 30 10 - 30 10 - 30
30 - 50
30 - 50
Average Maintained Footcandles (Vertical) (FC)
5 15 10
10
Restroom
18
7.5 - 30
Lunch & Break Room
15
5 - 20
EDUCATIONAL (SCHOOLS)
Classroom
40
30 - 50
Gymnasium
Class I (Pro or Div. 1 College)
125
30
Class II (Div. 2 or 3 College)
80
20
Class III (High School)
50
150
Class IV (Elementary)
30
100
Auditorium
7.5
3 - 10
5
Corridor
25
10 - 40
Range of Maintained Footcandles (Vertical) (FC)
Comments
5 - 15 5 - 15
@30" Above Finished Floor (AFF)
@30" AFF
Matte surface reflectance for the table 40% recommended
@30" AFF
2.5 - 10
This guide is a collaborative e ort of Energy Trust of Oregon and the Lighting Design Lab, Seattle, Washington.
Rev.07/2013
Building Area & Task
Average Maintained Footcandles (Horizontal) (FC)
INDUSTRIAL/MANUFACTURING
Assembly
Simple (Large Item)
30
Difficult (fine)
100
Component Manufacturing
Large
30
Medium
50
EXTERIOR
Parking (Covered)
5
Parking (Open) (Medium Activity)
Lighting Zone 3 (Urban)
1.5
Lighting Zone 2 (suburban)
1
Gas Station Canopy
12.5
Safety (Building Exterior)
1
RETAIL
General Retail (Ambient)
Department Store
40
Perimeter
Accent Lighting (Displays)
AUTOMOTIVE
Showroom
50
Service Area
50
Sales Lot (Exterior)
Lighting Zone 3 (Urban)
20
Lighting Zone 2 (Suburban)
15
GROCERY
Circulation
20
General Retail
50
Perimeter
BANKING
ATM
20
Range of Maintained Footcandles (Horizontal) (FC)
15 - 60 50 - 200 15 - 60 25 - 100
.75 - 3 0.5 - 2 10 - 15 0.5 - 2
50 20 - 80
25 - 100 25 - 100 10 - 40 7.5 - 30 10 - 40 25 - 100
10-40
Average Maintained Footcandles (Vertical) (FC)
30 100 30 50
.8 .6
15 75
10 30 20 15 7.5 20 50 15
Range of Maintained Footcandles (Vertical) (FC)
Comments
15 - 60 50 - 200 15 - 60 25 - 100
.4 - 1.6 .3 - 1.2
1FC min, 10:1 Max to Min Uniformity
If security is an issue-- raise average level to 3
7.5 - 30 35 - 150
5 - 20 15 - 30
10 - 40 7.5 - 30
3.5 - 15 10-40 25-100
3 - 10 times greater than ambient light levels
Vertical at face of ATM
NOTES: ? This guideis basedoninformationgatheredfromtheIES `The LightingHandbook1' 0thEdition.
It is highlyrecommendedthat all lightingprofessionalsreferto thefullIES guidewhenspecifying lightingprojects.
? At leasthalf of usersare in the25 - 65 agerange
? Horizontal--horizontapllanethat averagemaintainedfoot-candlesare measured
? Vertical--verticalplanetheaveragemaintainedfoot-candlesare measured
? It is theresponsibilityofthe
to determineandprovideappropriatelightinglevelsfor eachspace
Energy Trust of Oregon
421 SW Oak St., Suite 300, Portland, OR 97204
1.866.368.7878
503.546.6862 fax
Energy Trust of Oregon is an independent nonprofit organization dedicated to helping utility customers benefit from saving energy and tapping renewable resources. Our services, cash incentives and energy solutions have helped participating customers of Portland General Electric, Pacific Power, NW Natural and Cascade Natural Gas save on energy costs. Our work helps keep energy costs as low as possible, creates jobs and builds a sustainable energy future. Printed with vegetable-based inks on paper that contains 100% post-consumer waste. 7/13
Rev.07/2013
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