Patent ID: 8779653

Claim:
A solid state lighting device comprising: a base end; at least one solid state emitter; and a heatsink disposed between the base end and the at least one solid state emitter, and arranged to dissipate heat generated by the at least one solid state emitter; wherein: the heatsink includes a first end proximate to the base end, the first end having a first width; the heatsink includes a second end disposed between the base end and the at least one solid state emitter, the second end having a second width; wherein the lighting device includes one of the following features (i) and (ii): (i) the first width is greater than the second width, and width of the heatsink increases continuously with increasing distance in a direction from the second end toward the first end, and the heatsink is exposed to an ambient air environment, or (ii) the heatsink includes a width that increases, then decreases, and then increases again with increasing distance in a direction from the second end toward the first end to yield sequentially arranged first and second reverse tapered portions.