Lumen Power Sources West, Incorporated has been a leading specification lighting agency in Colorado since 1972. With offices in Denver and Colorado Springs, we are well positioned to respond quickly to the needs of the design and construction industry. Our mission is to provide the highest quality of service to the architectural community by offering our customers product information, technical and sales training, integration assistance, and other value-added services not typically available from, or expected of, a lighting agency. The Power of Illumination.