A lamp regulating method for an illumination source includes the following steps. A first parameter corresponding to a first object is set. The illumination source projects a light beam to the first object based on a first setting value. A first image is captured. A first sub-section image included the first object’s image in the first image is determined. The first parameter is modified as a first modified parameter according to the first object’s image. The first setting value is modified as a second setting value according to the first modified parameter for the illumination source. The illumination source projects the light beam to the first object based on the second setting value.一種燈光調整方法,使用於一照明光源。此燈光調整方法包括:設定一第一參數對應一第一物件。照明光源以一第一設定值投射光束至第一物件。擷取一第一影像。於第一影像內決定一第一子區域影像包含第一物件的影像。依據第一物件的影像修改第一參數為一第一修改參數。使照明光源依據第一修改參數修改第一設定值為一第二設定值。照明光源以第二設定值投射光束至第一物件。S11~S17‧‧‧各個步驟
