Lighting. Page: 4 of 17
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same area and require different lighting levels. For example,
a typist needs less than 10 footcandles to work effectively
at a computer. It makes no sense to locate this work
station next to a drafting table which is often illuminated
to 100 footcandles. Figure 1 illustrates some commonly
used lighting terms which you should be familiar with.
_ ~ I
LUMNe - AWouWr OF umIGr GIVEN OF'
t____M______ AMT OF LXv..4 VPECNlING 91JKJ'C -
Figure I: Familiarity with common lighting terms is help-
fnid when setting up a lighting conservation program.
Measuring Lighting Levels
You cannot determine where to lower lighting levels by
observation alone, you need to use a light meter. Light
meters sell for about $50, but it may be possible to rent or
borrow one from a local lighting contractor or your utility
company. If a consultant performs a walk-thru energy
audit ask the consultant to measure lighting levels, If you
take your own measurements, read the meter instructions
carefully and take several readings at each location.
When you are measuring daylight, take several readings
at different times during the day, on both cloudy and
sunny days to ensure accuracy.
Table I presents a general guide to appropriate lighting
levels for selected commercial applications based on
the 1981 Illuminating Engineering Society (IES) Hand-
book recommendations. An energy auditor or consul-
tant will be able to give you more detailed information
for your situation.
SUGGESTED LIGHTING LEVELS
FOR SELECTED COMMERCIAL APPLICATIONS
Area Light Level
Circulation area between work
Background beyond task at
circulation areas 10
Waiting rooms and lounges 10-20
Conference rooms 20-50
Secretarial desks 50-60
Filing areas 50
Kitchens 50 (average)
Cafeterias and snack bars 10-20
Drafting rooms 80-100
Accounting offices 80
Computer rooms, general 30
Computer rooms with self-
illuminating screens (CRTs)
These are suggested lighting levels and are
general in nature. Other considerations, such as
building codes, tasks at hand, age of workers,
importance of speed and accuracy in the task,
and reflectance and glare should be considered.
A more specific recommendation can be gained
from your lighting consultant.
7iuble : Use these lighting levels as a starting point for
assessing your current lighting levels.
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Administration., United States. Bonneville Power. Lighting., report, September 1, 1992; Portland, Oregon. (https://digital.library.unt.edu/ark:/67531/metadc1317287/m1/4/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.