Patent ID: 8058665

Claim:
An LED module comprising: an LED having an optical axis; and a lens located over and enclosing the LED, the lens comprising a surface of incidence facing the LED for an incidence of light emitted from the LED and a surface of emission located over the surface of incidence for an emission of the light emitted from the LED therethrough, the surface of incidence comprising a convex spherical surface, and the surface of emission comprising a concave spherical surface corresponding to the convex spherical surface; wherein the convex spherical surface refracts the light incident thereon to redirect the light to radiate on the concave spherical surface, through the concave spherical surface the light leaving the LED module as a wide and uniform beam, and a radius of curvature of the concave spherical surface is 1.5 to 2.5 times of that of the convex spherical surface.