About the author Prafulla C. Sorcar is President of Butterweck-Sorcar Engineering, Inc. and Director of 21st Century Lighting. He is the author of Rapid Lighting Design and Cost Estimating, selected as a Book-of-the-Month by the Architects' Book Club, and Energy Saving Lighting Systems, a popular reference-cum-text book. He has designed projects for several countries including Saudi Arabia, Mexico, Canada, and India. He is a registered professional engineer and a member of the Illuminating Engineering Society. He received his MS in electrical engineering from the University of Washington, Seattle.