This comprehensive guide explains how to plan and implement lighting retrofits to increase energy efficiency and improve the quality of visual performance. Lighting Retrofit Manual begins by outlining the benefits of retrofitting, then discusses when retrofits make sense, the entire retrofit process - from the data collection phase to maintenance - and explains the latest retrofit technologies and lighting system types. Special attention is given to calculation and retrofit audits to determine cost-effectiveness. The software programs used for this are considered, and demonstrated through the presentation of case studies of actual retrofit projects. This reference is sure to be used by any professional or student that will deal with a lighting retrofit project - whether as a designer, installer, manager, manufacturer, or consultant.