The share of energy
used for lighting in the industry is relatively smaller but the potential for energy conservation in a lighting system is quantitatively high. Lighting is used either to provide overall ambient lighting
throughout manufacturing, storage, and office spaces or to provide low-bay and
task lighting to specific areas. High-intensity discharge (HID) sources are
used for the former, including metal halide, high-pressure sodium, and mercury-vapour lamps. Fluorescent, compact fluorescent, and incandescent lights are
typically used for task lighting in offices. Lighting also generates a
significant amount of heat. The downstream savings of lighting efficiency
measures can therefore include cost savings in facility HVAC operation and
energy use. The magnitude of downstream savings depends on climate and weather
conditions.
Lighting controls: Lights can be shut
off during non-working hours by automatic controls, such as occupancy sensors
that turn off lights when a space becomes unoccupied. Occupancy sensors can
save up to 10-20% of facility lighting energy use.
Electronic ballasts: A ballast is a
mechanism that regulates the amount of electricity required to start a lighting
fixture and maintain a steady output of light. Electronic ballasts save 12-30%
power over their magnetic predecessors. New electronic ballasts have smooth and
silent dimming capabilities, in addition to longer lives (up to 50% longer),
faster run-up times, and cooler operation. New electronic ballasts also have
automatic switch-off capabilities for faulty or end-of-life lamps. The typical
energy savings associated with replacing magnetic ballasts by electronic
ballasts are estimated to be roughly 25%; however, the total energy savings
will depend on the number of magnetic ballasts still in use.
Replacing T-12 tubes with T-8 tubes: In
many industrial facilities, it is common to find T12 lighting tubes in use.
T-12 lighting tubes are 12/8 inches in diameter (the “T-“designation refers to
a tube’s diameter in terms of 1/8 inch increments). T-12 tubes consume
significant amounts of electricity, and also have extremely poor efficacy, lamp
life, lumen depreciation, and color rendering index. Because of this, the
maintenance and energy costs of T-12 tubes are high. Replacing T-12 lamps with
T-8 lamps (smaller diameter) approximately doubles the efficacy of the former.
Also, T-8 tubes generally last 60% longer than T-12 tubes, which leads to
savings in maintenance costs. Typical energy savings from the replacement of a
T-12 lamp by a T-8 lamp is around 30%.
Replacing mercury lights with metal halide
or high-pressure sodium lights: Where colour rendition is critical, metal
halide lamps can replace mercury or fluorescent lamps with energy savings of
50%.
High-intensity discharge (HID) voltage
reduction: Reducing system voltage will have a positive effect on energy conservation on the lighting system. As a rule
of thumb, a 10% reduction in lighting voltage will result in an energy savings of
10%. There are commercial products on the market that attach to a central panel
switch and constrict the flow of electricity to lighting fixtures, thereby reducing
voltage and saving energy, with an imperceptible loss of light. Voltage
controllers work with both HID and fluorescent lighting systems and are
available from multiple vendors. It is important to note that these voltage
stabilizers won’t have any savings with LED systems. Reducing voltage will even extend the lifetime of lights.
Daylighting: Daylighting involves the
efficient use of natural light in order to minimize the need for artificial
lighting in buildings. Increasing levels of daylight within rooms can reduce
electrical lighting loads by up to 70%. Unlike conventional skylights, an
efficient daylighting system may provide evenly dispersed light without
creating heat gains. The reduced heat gains will reduce the need for cooling
compared to skylights. Daylighting differs from other energy efficiency measures
because its features are integral to the architecture of a building; therefore,
it is applied primarily to new buildings and incorporated at the design stage.
However, existing buildings can often be cost-effectively refitted with
different daylighting systems like translucent sheets, light pipes etc. Various
daylighting systems are available on the market, some of which can be supplied
as kits to retrofit an existing building.
Daylight Harvesting - Sky Lights |
Daylighting can be combined with lighting controls to maximize its benefits. Because of its variability, daylighting is almost always combined with artificial lighting to provide the necessary illumination on cloudy days or after dark. Daylighting technologies include properly placed and shaded windows, atria, angular or traditional (flat) roof lights, clerestories, light shelves, and light ducts. Clerestories, light shelves, and light ducts accommodate various angles of the sun and redirect daylight using walls or reflectors. Not all parts of a facility may be suitable for the application of daylighting. Daylighting is most appropriate for those areas that are used in daytime hours by people. The savings will vary widely depending on the facility and buildings. Daylighting systems typically have a payback period of around 4 years, although shorter paybacks have been achieved.
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