On February 2, 2004, the University of Colorado Hospital opened the beautiful new Anschutz Cancer Pavilion on the new Fitzsimons Campus located in Aurora, Colorado. Physicians, employees and patients participated in the design of the state-of- the-art $148.8 million hospital, helping the architects achieve a functional, efficient building with spectacular views of the nearby Rocky Mountains. An important sustainability goal was to maximize the use of natural daylight, while using energy efficient controls to turn-off light fixtures in corridors and exterior areas during bright daylight hours. The reliance on natural daylight resulted in the design team’s need to control glare and heat transmitted through glazing and window systems.