It’s hard to argue with the numbers. That’s what Dan Lyons, owner of Pet Depot in Timonium, Md., discovered after he agreed to have an energy audit to assess the efficiency of his store’s lighting. Pet Depot (petdepotmd.com), a pet food and supply retailer, occupies a 7,500-square-foot space that includes an area for pet training classes, plus nine washing stations and a hydrotherapy pool for dogs. The Opportunity The implementation contr

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