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More than 2.2 million of the nation’s 2.7 million older (pre-1980) commercial buildings have been using the same lighting for the past three decades, the National Lighting Bureau reports, citing data published by the Department of Energy’s (DOE’s) Energy Information Administration (EIA). The Bureau estimates that 3 million or more commercial and other nonresidential buildings are candidates for money- and energy-saving lighting-system upgrades.