Lighting. Page: 3 of 17
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Lighting accounts for about one-third of the energy used
in commercial buildings. This amount is substantial and
so are the opportunities to conserve. The amount of
energy you use for your lighting system is generally
measured in kilowatt-hours (kWh); it is a product of the
amount of electricity used at a given time (kW) multi-
plied by the length of time in hours (h) that the lights are
on. There are two ways to reduce lighting energy use:
r >dify lighting systems so they use less electricity and/
or reduce the number of hours the lights are used. This
booklet presents a number of ways to do both. Topics
" Reassessing Lighting Levels
- Reducing Lighting Levels
- Increasing Bulb & Fixture Efficiency
- Using Controls to Regulate Lighting
" Taking Advantage of Daylight
A program to improve lighting efficiency and control
lighting use can produce significant savings. No-cost/
low-cost techniques can save 20 percent of your base
usage without compromising security, safety or task per-
formance. Modifying your lighting system with more
efficient fixtures can save an additional 20-40 percent. To
realize these savings, however, requires a systematic
approach. It is possible that changing a few bulbs and dis-
connecting a few fixtures will result in some savings, but
you won't begin to approach the savings possible until
you look at your lighting as a whole.
Reassessing Lighting Levels
It has been the practice in most commercial buildings to
maintain uniformly high levels of light throughout the
building. Over the last few years recommended lighting
levels have been changed; it is now generally acceptable
to reduce overall lighting levels and provide task or selec-
tive lighting where necessary. By reducing unnecessarily
high lighting levels you can produce substantial savings
on your lighting bill.
Before you make any changes in your present system,
you should examine your current lighting practices. You
can do this yourself or have an energy auditor or consul-
tant perform a lighting audit for you as part of a walk-thru
energy audit. To conduct a lighting audit, go through your
building room-by-room or area-by-area with a Building
Operation Schedule in hand. (For more information and
a sample form, see the Energy Management booklet in
this series.) As you go through the building, take note
of the activities or tasks being performed, the current
lighting levels and the recommended levels. Also take
note of the number and types of fixtures used and the
number of switches available to control them. This
information will be useful in reassessing your lighting
needs and for discussing and planning changes in
bulbs, fixtures or controls.
Lighting is often excessive in halls, corridors, lobbies
and waiting rooms. Take note of tasks that occur in the
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Administration., United States. Bonneville Power. Lighting., report, September 1, 1992; Portland, Oregon. (https://digital.library.unt.edu/ark:/67531/metadc1317287/m1/3/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.