Optical devices and systems having a converging lens with grooves

A lighting system, comprising:

• a lighting module including a semiconductor light-emitting device configured for emitting light emissions along a central light emission axis;
• a first lens module including a first converging lens having a light output surface being spaced apart along a lens axis from a light input surface, the converging lens further having a total internal reflection side surface being spaced apart around the lens axis and having a frusto-conical shape extending between the light input and output surfaces of the converging lens;
• wherein a portion of the light input surface of the converging lens includes a light input cavity being bounded by a perimeter, the light input cavity having a central axis and being generally shaped as a portion of a spheroid;
• wherein the light input cavity has a plurality of grooves each respectively following one of a plurality of splines along the light input surface that intersects with the central axis of the light input cavity and with one of a respective plurality of points on the perimeter;
• and
• wherein the lighting system is configured for aligning the lens axis with the central light emission axis.