Sample Lighting Retrofit Proposal in Detail
How can I reduce lighting cost?
Though the energy used by a single light is small, if you use energy-efficiency practices with all your lights, the savings can add up.
To reduce your lighting costs, consider:
- Evaluating your lighting needs (in case of an overlit facility, delamping might be appropriate).
- Replacing T12 fluorescent lights with more energy efficient T8 lights and electronic ballasts.
- Replacing old exit lights with new energy efficient ones that use fluorescent or LED technology.
- Installing controls such as timers, time clocks or photocells to ensure that exterior lights are turned off at the appropriate time.
- Replacing incandescent lights with ENERGY STAR®-qualified compact fluorescent lights that can reduce lighting costs by up to 70 percent and last up to eight times longer.
Fluorescents Old to New:
T12 vs. T8
T12 to T8, to T5
In general, fluorescents are about 4x more energy efficient than incandescent (household type bulbs). The T12 lamps have been around forever and have always been the standards. They operate on either electromagnetic or electronic ballasts. T8's are a new technology - smaller diameter, operate ONLY from electronic ballasts.
How much energy can be saved by switching from T12 lights and magnetic ballasts to T8 lights and electronic ballasts?
If you replace your existing T12 lighting system with T8 lights and magnetic ballasts with electronic ballasts, you will see a reduction of
lighting energy by 17 to 48 percent depending on the specific lights and ballasts. In some instances, you may want to remove some of the existing
T12 lights and not replace them. You may also use one electronic ballast to serve four lights instead of one magnetic ballast for two lights previously
installed. Or, you may use specular reflectors to further enhance light distribution. The overall result may bring 50 percent savings without compromising
the quality of delivered light.