First I want to thank my wife Julie Leonard, without whose tireless support, patience and humor this work would never have been possible.

I appreciate the support and assistance of Professors Krarti, Brandemuehl and Rabl, who have guided this work to its completion.

I want to thank the National Center for Atmospheric Research, and particularly Wayne Morrow and the Facilities Support Services people, who permitted and assisted my data collection because I asked. In addition I want to thank Karl Johnson of the Electric Power Research Institute, William Blitzer of Lightolier and Genlyte, and Steven Stannard of Illumination Arts, Inc. for their help and encouragement in the initial research which provoked my interest in and demonstrated the need for the work which is presented here.

I want to thank Public Service Company of Colorado for providing information on rates and user surveys. Evan Evans and Fred Porter of Boulder Energy Associates provided help beyond my requests. I want to thank Scott Pigg of the Energy Center of Wisconsin for his very timely work in providing data which could be compared with my own. I want to thank James Waterman of enfo.com for support services and site development, making this work easier for me and accessible to all.

I want to thank all the people who answered my telephone calls and email messages on their own time and helped me to keep moving forward.