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Lighting is a building component that is utilized daily and is a contributor to energy performance and utility costs. Because of this, lighting systems are continuously improving in energy efficiency due to new technologies and changes in the electrical code design. These changes can assist in reducing peak performance levels and energy costs. There are multiple options available to provide the owner with quality lighting, both interior and exterior, while reducing a building’s lighting energy consumption.

LIGHTING USE REDUCTION:

Replace Existing Light Fixtures with Energy Efficient Fixtures
Dated light fixtures consume a significant amount of energy. The most energy efficient improvement would be to replace the entire fixture, however fixture elements, such as lamps and ballasts, can be replaced and still reduce energy consumption.   • Compact fluorescent lamps (CFL) have a longer life, up to 10,000 hours on average, compared to 750 to 1,000 hours for incandescent bulbs. CFLs can save up to 75% in energy costs compared to similar light output of incandescent bulbs. Their lower lamp temperature help reduce the overall building mechanical load. CFLs are also instant start and flicker-free.     • Light emitting diode (LED) exit signs have a 25 year plus service life. These low-energy fixtures consume only 3.2 watts compared to 30 to 50 watts for conventional incandescent exit fixtures. This allows the replacement of LED exit signs to have a quick payback.     • Electronic ballasts provide a 30 to 40 percent energy savings over magnetic ballast systems. Electronic ballasts also eliminate lamp flicker and are quiet during operation. They generate very little heat, reducing the building’s air conditioning load. Lightweight dimming ballasts are also available. These ballasts are universal voltage, therefore reducing the amount of shelf stock to maintain.     • Energy efficient fluorescent lamps have a 50 percent longer life span than standard T8 lamps and are rated up to 36,000 or more hours allowing a reduced maintenance schedule. These lamps also retain more of their lumen output over life expectancy than other lamps. These lamps are flexible with use with availability in multiple wattages and dimming capacities.     • Pulse-Start HID Lamps have a higher maintained lumen output, and a 20,000 to 30,000 hour lamp life. Due to their high lumen output, the number of fixtures required to meet lighting design is reduced. These lamps offer better lumen maintenance over traditional HID lamps. In addition to energy efficiency, these lamps offer better color rendering and faster start up times.     • LED lamps are an energy efficient option. They consume anywhere from 1-6 watts, providing an energy cost savings up to 70% over incandescent. They have an average lifespan of 50,000 hours and extend re-lamp cycles, reducing required maintenance and obstruction access. These lamps are most effective in areas where directional light is preferred.
Re-Evaluate Light Fixture Layout with More Efficient Fixtures
With the improvement in light fixtures, existing lighting layout may be evaluated to potentially reduce the number of fixtures and still provide the same amount, but better light. Fixture location can be adjusted to accommodate occupancy use. In addition, Illuminating Engineering Society (IES) and ASHRAE codes have stated more restrictive watts per square foot lighting levels in most occupancies. Illumination levels and fixtures for room application and tasks performed can be reviewed.
Install Lighting Control Systems to Manage Lighting
• Occupancy sensors provide the ability for lights to automatically turn off when the room is unoccupied. Sensors prove to be beneficial in almost every room, especially for offices and classrooms.     • Multi-level lighting provides the user with the ability to control the amount of light on in a room, especially if peak lumens are not needed.     • Task lighting provides the ability for an individual to control their lighting comfort. Conventional buildings tend to only have fixed-intensity general lighting systems which illuminate indoor spaces without consideration of specific tasks and individual occupant comfort. By providing task lighting, an individual can control their immediate lighting needs.
Replace Existing Exterior Lighting and Install Exterior Lighting Controls
Exterior light fixtures can also be as dated, if not more, than interior light fixtures. Dated fixtures consume more energy than those with newer technologies. By replacing existing fixtures with more energy efficient fixtures, a cost savings can be generated. In addition, by placing exterior lighting on time or motion sensors, it eliminates the likelihood of lights being left on when not in use or throughout the day when unnecessary.