IES LP-9-20:2020 Edition

Increasing lighting efficiency is often the most cost effective energy efficiency improvement that can be made to an existing building. There are three basic approaches for improving the energy efficiency of an existing lighting system: retrofit, redesign, or a combination of both. Retrofitting the existing luminaires is the more common approach. However, depending on a variety of factors, redesign may be the better choice. A thorough assessment is necessary to determine which of these methods is advantageous. This document addresses the general methods of performing a successful lighting upgrade. The designer should consult the latest product information obtained directly from lighting manufacturers for the most current data.