Patent ID: 8272767

Claim:
An LED module comprising: an LED having a central axis I; a lens covering the LED, the lens having an light incident face for incidence of the light of the LED and an opposite light emitting face for refracting the light of the LED out of the lens when the light extends through the lens; and a three dimensional coordinate system consisting of an X axis, a Y axis, a Z axis and an origin O, wherein the origin O is located in a center of the LED, the X axis extends from the origin O and corresponds to a lengthwise direction of the lens, the Y axis extends from the origin O and corresponds to a widthwise direction of the lens, the Z axis extends from the origin O and corresponds to a height direction of the lens, the central axis I is coincident with the Z axis; wherein the light emitting face of the lens has a central axis II, the central axis II is parallel to and offsets from the central axis I, and the central axis II is located at a side of a plane ZOX; wherein light beams emitted out from the light emitting face of the lens at the side of the plane ZOX through which the central axis II extends are stronger than light beams emitted out from the light emitting face of the lens at another side of the plane ZOX.