Patent ID: 7618163

Claim:
LED apparatus for illumination toward a preferential side in a downward and outward direction, comprising: a light emitter having at least one LED on a base; a primary lens positioned over the light emitter and having a central axis; a secondary lens placed with an inner surface surrounding the primary lens, the secondary lens having (a) a base-adjacent lower end defining a main plane substantially perpendicular to the central axis and (b) a compound outer lens surface with a middle-region reference point defining a reference axis parallel to the central axis, the compound outer lens surface including: a principal perimeter surface centered on the preferential side, the principal perimeter surface (a) projecting from the base-adjacent end downwardly and inwardly to a ridgeline defined by the set of outer-lens-surface points in each reference-axis half-plane that are farthest from the main plane and spaced from the reference point, the ridgeline subtending a substantial angle about the central axis, and (b) terminating inwardly at the ridgeline; a middle region inward of the ridgeline, containing the middle-region reference point and having a concavity thereabout; and a non-principal perimeter surface centered on the non-preferential side and adjoining the middle region and the principal perimeter surface.