LED lighting device

A lens assembly for at least placing a first light source and a second light source, comprising:

• a first lens, wherein the first lens is in a shape of a ring and comprises a first light-entering surface, a first light-emitting surface and a first placement space on a side of the first light-entering surface for placing the first light source, and both the first light-entering surface and the first light-emitting surface are curved surfaces;
• a second lens, wherein the second lens comprises a second light-entering surface, a second light-emitting surface and a second placement space on a side of the second light-entering surface for placing the second light source, and both the second light-entering surface and the second light-emitting surface are curved surfaces;
• and wherein
• the first light-emitting surface and/or the first light-entering surface is provided with a plurality of ridges uniformly distributed along an extension direction of the first lens, each of the ridges extends in a shape of a curve along the first lens;
• and
• a curvature of each of the ridges is the same as a curvature of the first light-emitting surface or the first light-entering surface.

A method of manufacturing a LED lighting device, comprising:

• providing a housing, a light source component, and an optical lens located above the light source component and wherein the optical lens is configured to distribute light for the light source component;
• providing a reflector in contact with the optical lens and a surface ring assembled on the reflector;
• sequentially arranging the housing, the light source component, the optical lens, the reflector and the surface ring;
• fixing the surface ring on the housing to delimit a receiving chamber, and positioning the light source component, the optical lens and the reflector in the receiving chamber;
• and
• placing the LED light source particles on a light source base plate comprised in the light source component wherein light of the LED light source particles sequentially passes through the optical lens and the reflector and then emits through a light exit of the LED lighting device,
• wherein the optical lens comprises a first lens, a second lens, and a third lens, the second and the third lens are both annular lenses surrounding the first lens, and a height of the first lens is greater than a height of the second lens and is greater than a height of the third lens, and the second lens and the third lens have a same height.