Patent ID: 6773139
Filing Date: 2004-08-10
Classification: F21S,F21V,F21Y,H01L

Abstract:
A variable angular distribution lamp comprising:a substrate; a first lighting unit comprising: a first light emitting diode (LED) arranged on the substrate, and a first lens element having a first optical prescription, said first tens element being arranged to interact with light produced by the first LED to produce a first lamp illumination having a first angular distribution; a second lighting unit comprising: a second light emitting diode (LED) arranged on the substrate, and a second lens element having a second optical prescription different from the first optical prescription, said second lens element being arranged to interact with light produced by the second LED to produce a second lamp illumination having a second angular distribution that is different from the first angular distribution; and, a controller for energizing a selected one of the first lighting unit and the second lighting unit to produce a lamp illumination having a selected one of the first angular distribution and the second angular distribution, the controller including a first switch selectably operated to energize the first lighting unit and a second switch selectably operated to energize the second lighting unit.