A light device includes one or more light members disposed behind a hood, to generate lights. A remote detecting device may be used to detect whether one or more users go toward or go close to the light or not, and to actuate the light member to generate the lights when the users are detected to go toward the light. The light device may thus be actuated to generate light without being actuated or contacted by the users or without being operated or contacted by the users manually. A control device may be used to actuate the light member to generate the light. The remote detecting device includes a light emitting device to generate a light to detect whether the user goes toward the light or not.