In order to solve this problem, this paper introduces a reading lamp which can change the lighteness automatically.It ha即可减少手动调光的麻烦，又可以保护视力，同时，它具有稳光功能，当电源电压波动时，台灯亮度保持不变。
In sleeping rooms an electric reading lamp should be installed at the head of each berth.在卧室里，应在每个铺位的床头安装一个台灯。