Lighting
Equipment to Reduce Energy
Consumption & Demand
Lamp and
fixture choices should optimize light distribution and fixture
spacing. This not only reduces capital cost and energy consumption,
it can also improve space esthetics and atmosphere.
T5 lamps
are an energy-efficient choice for general lighting in new
designs; they are shorter and 40% smaller in diameter than
a T8. These lamps allow fixtures with a very slim profile.
However, T5s are not a retrofit lamp; fixtures must be designed
specifically for use with T5 lamps and with a light distribution
that matches design needs. T8s rewired to share ballasts are
often an economical retrofit option.
Select
electronic ballasts for fluorescent lamps, and use their ability
to adjust light output to optimize capital and operating cost.
High ballast- factor ballasts can produce up to 128% of the
normal light output without sacrificing lamp life. Although
there is an increase in power consumption on a per-lamp basis,
careful design can reduce the number of lamps or fixtures
required.
Metal
halide lamps are a good choice for efficient ambient lighting
of high-ceiling spaces. High-pressure sodium (HPS) lamps also
serve well, for areas where color rendition is less critical.
The use
of compact fluorescent lamps with dimmers is a viable option
in many applications. Screw-base lamps are now available that
can be used with most inexpensive incandescent dimmers.
Mercury
content of lamps is another environmental concern. Fluorescent
lamps with reduced mercury content, and mercury- and lead-free
HPS lamps are now available with no reduction in lumen output
in a wide range of wattages. Specify these lamps whenever
possible.
Light-emitting
diode (LED) exit signs are currently one of the most efficient
technologies, with less than two watts per face power draw.
Cautions
- Technology
is rapidly changing. Lighting consultants can help with
energy-efficient design.
- Lamp
and fixture selection and installation should include earthquake
protection.
