A luminous system is disclosure. The luminous system is used for projecting light to a plane and includes a luminous component and an angle-adjustable device. The luminous component is used for generating the light ray. The angle-adjustable device is used for adjusting luminous angle of the light ray. The angle-adjustable device is arranged between the plane and the luminous component and located on the route of the light ray, the angle-adjustable comprises a first lens element, and the first lens element comprises a light-emitting portion and a light-incident portion connected to the light-emitting portion. The light-including portion comprises a recess opposite to the light-emitting portion. An outer diameter of the light-emitting portion is larger than an outer diameter of the light-incident portion, and the outer diameter of the light-incident portion decreases along a direct away from the light-emitting portion.