Patent ID: 7530706
Filing Date: 2009-05-12
Classification: F21L,F21V,F21Y,G02B,Y10S

Abstract:
1. A light-emitting diode (LED) lighting apparatus, comprising: a main body having a power source; a light-emitting diode electrically connected with the power source and positioned at a front end of the main body, the light-emitting diode emitting light beams; a collar coaxially coupled to the main body; a convex lens coupled to the collar and optically coupled to the light-emitting diode in coaxially displaceable manner relative thereto, the convex lens defining a predetermined focal length, said convex lens being selectively displaceable between a first range and a second range, said first range being from the light-emitting diode to a first position offset from the light-emitting diode by the predetermined focal length, said second range being from the first position to a second position offset from the light-emitting diode by twice the predetermined focal length; and at least one of said main body and collar having a pair of annular engagement portions axially offset one from the other for releasably locking said collar to the main body to locate the convex lens respectively in said first range and second range; whereby brightness of the light is optimally maintained for a greater range of illumination when the convex lens in said second range than in said first range.