Chapter 6 Overview

On average, lighting consumes 25% of the energy used by office buildings in the U.S. Many office buildings operate with highly inefficient lighting systems, with lighting that stays on when spaces are vacant, daylit spaces that are artificially lit all day and outdated lighting source technologies. In addition to having a high energy demand, inefficient lighting systems release a large portion of drawn electricity as waste heat, adding to an office’s cooling load and requiring additional energy expenditure for air-conditioning. As a result, increasing lighting efficiency not only decreases energy costs associated with lighting, but may also reduce energy costs associated with HVAC. The efficiency of an office lighting system can be increased through:

• Education and behavioral changes, such as encouraging employees to turn off
unnecessary lights

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• Lighting controls that ensure light levels are adjusted to the correct intensity and
lamps are illuminated only when and where they are necessary

• Upgrading lighting systems with higher efficiency technologies

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