Lighting contributes significantly to energy use in buildings, both nonresidential
and residential. Not only do the lights themselves use energy (e.g.
13% of the total energy use in Florida schools) but lights also increase
air conditioning (AC) load by approximately 23%. Thus, lighting significantly
impacts energy use and more energy efficient technologies are advantageous.
Nonresidential lighting: Commonly in place in the nonresidential sector are the T12 lamp-magnetic ballast lighting systems. Research has shown that T8 lamp-electronic ballast systems consume less energy, provide better illumination than T12 systems, and run cooler than the T12 systems.
Task Lighting: Common incandescent or halogen bulbs varying energy use from 40 W to 200 W and will also contribute heat gain to the building. These bulbs should be replaced by compact fluorescent lamps (CFLs). CFLs provide a similar quality of light, use much less energy and operate cooler than incandescent and halogen lamps. CFLs also last up to 10,000 hours compared to 1000 hours for normal incandescent bulbs. CFLs can save 47% in task lighting energy use with a simple payback of 2 to 3 years, not including the greater life of the CFLs. CFLs fit into most existing fixtures so replacement of the fixtures is not necessary.
Sensors: occupancy sensor technologies, when used effectively,
can also significantly reduce energy consumption. Infrared or ultrasonic
occupancy sensors can be used to turn on and off lights and the HVAC
system when a room is occupied for a set period of time. These sensor's
relative performance can be expected to vary with space vacancy rates,
timing of occupancy and it's relation to the switch time delay.
Daylighting: taking advantage of existing daylight can save 24% - 51% of lighting electricity use depending on window orientation and presence of window shading devices. In Florida, shading is used to reduce heat gain and glare. However, any glazings used on windows should be spectrally selective allowing in visible light but rejecting near infrared light. For more information, check out our Window Basics page.
|PF283||Field Commissioning of a Daylight-Dimming Lighting System|
|PF301||Side-by-Side Testing of Commercial Office Lighting Systems: Two-lamp Fluorescent Fixtures|
|PF305||Daylighting Dimming and Energy Savings: The Effects of Window Orientation and Blinds|
|PF309||Measured Field Performance and Energy Savings of Occupancy Sensors: Three Case Studies|
|PF310||Daylight Dimming Systems: Studies in Energy Savings and Efficiency|
|PF340||Daylighting: Measuring the Performance of Light Shelves and Occupant-Controlled Blinds on a Dimmed Lighting System|
|CR867||Energy Efficiency Technology Demonstration Project for Florida Educational Facilities: Occupancy Sensors|
|CR914||Results from a Comprehensive Residential Lighting Retrofit|
|CR1008||Energy Efficient Florida Educational Facilities: Improvements to a Portable Classroom in a Volusia County School|