为节省照明用电,国内外正在研制各种高光效节能灯泡,如荷兰的“SL”灯泡和美国哈拉克灯泡已相继问世,但价格高,广大家庭很少购用。因此变光灯作为住宅照明仍是节电的重要途径。过去,一般居室装置几个瓦数不同的灯泡,按所需要的亮度来选开 In order to save electricity for lighting, a variety of high-efficiency energy-saving light bulbs are being developed at home and abroad. For example, the Dutch “SL” bulbs and the American Harak bulbs have come out one after another, but the prices are high and the majority of households rarely purchase them. Therefore, dimming lights as residential lighting is still an important way to save electricity. In the past, the general living room installed a few bulbs with different wattages and selected them according to the required brightness.