Patent ID: 8746935

Claim:
An adapter lens, comprising: an inner converging lens part; a convex light output region; a front conical light output region; an outer reflector part; a rearwardly open blind hole defined by a surface including a flat base surface between a frustoconical side surface, that together define a light incidence region and a frustoconical hole having an inner end diameter along the flat base surface, and an outer end diameter, and the frustoconical hole configured for allowing longitudinal movement of a light emitting diode (LED) light source along an optical axis within the frustoconical hole for moving the focal point of the adapter lens and correspondingly dimensionally changing a light cone emitted from the adapter lens caused by light rays from the LED light source, the light rays being refracted by the inner converging lens part, reflected by the outer reflector part, and transmitted through the convex light output region and front conical light output region; and, the adapter lens has a height H and a maximum diameter MD, and the ratio of the height H to the maximum diameter MD is greater than 0.5, and, a cross-sectional view of the adapter lens the front conical light output region includes a curved annular front wall of a single curvature with a slope that radiates from the convex light output region and curves upwardly and outwardly in a non-linear configuration.