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It's not easy being green! - Kermit T. Frog   Home Building A Green School 10 Steps toward Sustainability Lighting and Electrical

 



Fossil Ridge High School, CO applies the daylighting strategy to reduce the need for artificial lighting.
Resource: greenbuilding.com
 
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    Indirect lighting can provide excellent uniform artificial lighting in a classroom, eliminating glare and contrast between bright and dark area.
    Resource: Edward B, Nuhfer, Director of Faculty Development, California State University of the Channel Islands.
  • Lighting System
    Specifying a high quality energy efficient lighting system that utilizes both natural and electric sources can provide a comfortable yet visually interesting environment for students and teachers in a school. The ability to read comfortably and perform visual tasks has direct bearing on the performance of the students. Lighting strategies that reduce glare while still producing the required lumen levels are essential components of a high performance school.
  • Energy Costs
    Lighting represents 25%-40% of the typical school’s energy costs. An energy-efficient lighting system can save thousands of dollars annually as a well designed system reduces the energy requirement for both lighting and air conditioning. Lighting controls in day lit spaces can automatically adjust light levels as needed. Programmable and occupancy controls on lighting assure that spaces do not remain lit when not in use.
  • Lamp Technology
    For the greatest energy efficiency and best color rendering, school lighting should employ either fluorescent T-8 or T-5 linear lamp technology with electronic ballasts. T-5 linear lighting systems are best suited to new schools or schools undergoing major remodeling. T5 lamps are 40% smaller than T8s, but are capable of delivering as much or more light from smaller fixtures. Latest developments include LED lighting, which can reduce energy use even further. Replacing metal halide lights with appropriate CFLs in high bay areas such as gymnasiums can offer better quality light with less energy use.in a smaller area.
  • Three Strategies
    Your design team can create an energy-efficient, high quality lighting system by following three strategies. First, select efficient lamps, ballast, lenses, and fixtures that address the needs of each space and achieve the highest output of lumens per input of energy. Second, provide occupancy sensors, time clock, and other controls that limit the time the light are on to only hours when the space is occupied and the light is needed. There are two commonly used occupancy sensor which are infrared and ultrasonic. Infrared sensors occupant by sensing changes in heat as occupant move, while ultrasonic sensors detect movement of solid objects. And third, provide automated daylighting controls that dim the electrical lighting when sufficient natural light is present.
 
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