The US Department of Energy (DOE) acknowledges that as the LED market has matured, lighting manufacturers have developed methods to accurately calculate product performance within a product family.
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Responsible lighting design requires that we understand how our vision changes with age.
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Ballast factor impacts light level and energy, and also plays a role in fixture quantity and installation costs.
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LEED 2009 for Commercial Interiors contains 37 points under Energy and Atmosphere (EA).