SAD lamp       
noun [ C ] uk/ˈsæd ˌlæmp/ us/ˈsæd ˌlæmp/
 SAD灯(一个产生紫外线光的设备,用于在冬季为人体补充维生素D或帮助缓解季节性情感障碍)
a device that produces ultraviolet light, used for providing a person with vitamin D in winter or helping with the effects of SAD (= a medical condition in which a person does not have much energy and enthusiasm during the winter because of the reduced period of natural light)
  Morning is the best time to use a SAD lamp. 早上是使用SAD灯的最佳时间。 
 Synonyms: light boxsunlamp
See also: seasonal affective disorder
 - More examples
 - The purchase of a SAD lamp last year has really taken the edge off my suffering.
 - SAD lamps work by imitating daylight and thereby address interruptions to our body clock by giving the user a blast of high-level light.
 - The affliction SAD has created a new business area, namely the manufacture of SAD lamps.