In Illinois, only about a dozen people hold a CLC (Certified Lighting Consultant) certificate, the most prestigious designation offered by the American Lighting Association. Five of these CLC holders service customers at Lightology, North America's largest contemporary lighting showroom. While the showroom is located in Chicago's loop, Skokie houses Lightology's giant corporate warehouse. Founded in 2000, Lightology prides itself on its expert customer service and vast selection of lights and lighting fixtures, from light bulbs to Swarovsky crystal chandeliers. Lightology also offers personalized lighting design consultations for both homes and businesses.