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美国的商业建筑中照明所需的电力占此类建筑总用电量的４０％左右。为了节约照明用电，开发和应用了许多有效的照明装置，发展和应用新的和改进的照明设计，并改进了照明能量管理程序。昼光照明的应用也包括在这三个方面内。本文只着重介绍ＰＧＥＣ（太平洋煤气和电力公司）将昼光照明作为降低峰值负荷的手段所进行的研究。 ＰＧＥＣ自１９７３年起就参与了通过改进产品和照明系统的管理来节约照明用能的研究。其中包括了使用固态高频荧光灯镇流器替换白炽灯、使用小功率荧光灯、荧光灯调光以及改进荧光灯装置的反射性能等。这些工作中的大部分是与美国能源部和ＬＢＬ（Ｌａｗｒｅｎｃｅ Ｂｅｒｋｅｌｅｙ实验室）合用的。此实验室负责能源部资助的一项关于窗和照明的研究，这项使用的结果建议于１９７８年与一昼光照明控制装置的制造厂合作，以确定这种昼光系统的商业效果。 １９７９年年中，选定旧金山市区内ＰＧＥＣ总部办公楼的第３０层作试验。此层的总面积为２６０００平方英尺，其中１９０００英尺为办公室，４０００平方英尺为走道，剩下的３０００平方英尺为电梯和楼梯等，只有靠外墙的一个区域作为昼光试验区，办公室都为用隔到顶的墙分开的小办公室，进深为５．１米，宽为４～７米，窗墙比为
The electricity needed for lighting in commercial buildings in the United States accounts for about 40% of the total electricity used in such buildings. In order to save lighting power, many effective lighting devices have been developed and applied, new and improved lighting designs have been developed and applied, and lighting energy management programs have been improved. The application of dawn lighting is also included in these three aspects. This article focuses only on the research conducted by PGEC (Pacific Gas and Electric Co.) as a means to reduce peak load. Since 1973, PGEC has been involved in the study of saving lighting energy by improving the management of products and lighting systems. These include the use of solid-state, high-frequency fluorescent lamp ballasts for replacement of incandescent lamps, the use of low-power fluorescent lamps, the dimming of fluorescent lamps, and improvements in the reflective performance of fluorescent devices. Much of this work is in conjunction with the U.S. Department of Energy and the LBL (Lawrence Berkeley Laboratory). The lab is responsible for a study on windows and lighting funded by the Department of Energy. The results of this use are proposed in 1978 in cooperation with a lighting control device manufacturer to determine the commercial effect of this light system. In mid-1979, the 30th floor of the PGEC headquarters building in San Francisco was selected for testing. The total area of this floor is 26,000 square feet, of which 19,000 feet are offices, 4,000 square feet are walkways, and the remaining 3,000 square feet are elevators and stairs. Only one area of the outer wall is used as a light test area. The offices are all In a small office separated by a wall with a ceiling, the depth is 5.1 meters, and the width is 4 to 7 meters. The ratio of window to wall is