提高照明效率通常是对现有建筑进行的最具成本效益的能效改进。改善现有照明系统的能源效率有三种基本方法:翻新、重新设计或两者结合。改造现有灯具是更常见的方法。然而，根据各种因素，重新设计可能是更好的选择。需要进行彻底的评估，以确定这些方法中哪种是有利的。本文档介绍了成功进行照明升级的一般方法。设计师应查阅直接从照明制造商处获得的最新产品信息，以获取最新数据。

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.