A sunray lamp is a type of lamp that uses ultraviolet light to mimic the effects of sunlight. This type of lamp is commonly used to treat seasonal affective disorder, or SAD, which is a type of depression that occurs during the winter months when sunlight is scarce. However, there are several synonyms for sunray lamp that can be used interchangeably, such as full-spectrum lamp, daylight lamp, and bright light therapy lamp. Each of these terms refers to a lamp that emits a broad spectrum of light, including ultraviolet light, in order to mimic the natural sunlight that is necessary for our physical and emotional well-being.