Patent ID: 8007140

Claim:
An LED (light emitting diode) module comprising: an LED having an optical axis; and a lens fixed over the LED for refracting light emitted by the LED out of the LED module, the lens having a concaved incidence surface for the incidence of the light into the lens and an opposite convex emission surface for the emission of the light out of the lens; wherein the lens is symmetric relative to a first plane on which the optical axis of the LED is located, a peak light intensity in the first plane occurring within 0-5 degrees off the optical axis of the LED, a light intensity in the first plane decreasing from the peak light intensity with the increase of the angle off the optical axis; and wherein a second plane is perpendicularly intersected with the first plane at the optical axis, a peak light intensity in the second plane occurring within 33-41 degrees off the optical axis, a light intensity in the second plane at the optical axis being larger than a half-peak light intensity in the second plane, the light intensity in the second plane increasing with the increase of the angle off the optical axis from 0 degree to 33 degrees.