近年来几乎所有新建大厦都装有嵌入式筒灯。美国能源部估计全美仅在住宅建筑内就安装有多于4亿盏筒灯,并且其数量正在以每年两千万的速度增长。在商业和住宅领域,筒灯经常被安装于高使用率区域,并在提高照明能效和使用寿命方面常作为一个衡量目标。这种灯的普及引起了人们对LED In recent years almost all new buildings are equipped with recessed downlights. The U.S. Department of Energy estimates that more than 400 million downlights are installed in residential buildings throughout the United States and is growing at a rate of 20 million annually. In commercial and residential areas, downlights are often installed in high-usage areas and often serve as a measure of efficiency and service life. The popularity of this lamp has caused people to LED