www.greentechenergy.com CASE STUDY: PARKWAY CORPORATION, Philadelphia, Pennsylvania Parkway Corporation, a privately owned company that owns, manages, and leases commercial parking facilities, has over 100 locations totaling 30,000 parking spaces. The company hired GreenTech Energy Services to upgrade the lighting at its 175,000 square foot garage at 12 th and Walnut Streets in Philadelphia. Inside the garage, 100 watt metal halide fixtures were replaced with two-lamp 32-watt vaportight T8 fluorescents, with high power ballasts. Incandendscent lights in the exit signs were placed with LED lights. In the offices, trash rooms, security management, corridors and other operations areas, T12 fluorescents were replaced with T8’s, and both wall switch and ceiling sensors wer

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