Abstract: A downlight with multiple switchable lighting modes is disclosed. The downlight includes a ring body. A light guide ring is disposed inside the ring body. A radiator is disposed above the light guide ring. A diffusion cover is disposed on the inner side of the radiator. A light guide plate is disposed above the diffusion cover. Reflective sheet is disposed above the light guide plate. A second light source is connected to an inner wall of the radiator. A first light source is disposed between the ring body and the radiator. A backplate is connected above the ring body.

Abstract: A downlight is disclosed, including a cylindrical body. Springs are symmetrically connected to a side surface of the cylindrical body; a lamp body is provided inside the cylindrical body; a limiting ring is provided at an upper end inside the cylindrical body; a rotatable disk is provided above the limiting ring; the lamp body and the rotatable disk are connected through a connecting member; two ends of the connecting member are connected to the lamp body and the rotatable disk through friction pivots, respectively; and a upper cover is connected to an upper portion of the cylindrical body.

Abstract: Disclosed is an angularly adjustable Fresnel turning lens, including a lens body, where one side surface of the lens body is a surface A, and the other side surface of the lens body is a surface B, where a convex cambered surface is provided at a middle position of the surface A, and a third convex surface, a second convex surface, and a first convex surface are provided successively at an outer side of the convex cambered surface; a concave cambered surface is arranged at a middle position of the surface B. An implementation method of the angularly adjustable Fresnel turning lens is also disclosed. In the present disclosure, a light-emitting angle may be adjusted only by turning the lens body, and compared with the focusing mode in the related art, this lens has the features of a smaller amount of material and a smaller weight and volume, thereby reducing the cost of the lens.

Abstract: A lens capable of rotatably adjusting a light emitting angle is disclosed, and the lens includes a lens body, where the lens body is provided with a plurality of lens rings in an equal spacing manner from inside to outside; each lens ring includes a plurality of first lens portions and a plurality of second lens portions, which are alternatively arranged and have different light emitting angles; and the first lens portions and the second lens portions on two adjacent lens rings are staggered. An optical system capable of rotatably adjusting a light emitting angle and an implementation method for the optical system capable of rotatably adjusting a light emitting angle are further disclosed. The lens body is matched with a light source plate.