Beam shaping lens and led lighting system using same

A lighting system comprising:

• an LED light source;
• a reflector to reflect at least a portion of the light from the LED light source;
• and
• a lens disposed to receive the light from the LED light source, the lens further including an entry surface comprising a plurality of concentric rings having non-vertical sides.

A method of assembling an LED light fixture, the method comprising:

• providing a reflector;
• arranging an LED light source proximate to the reflector;
• connecting the LED light source to a power supply to enable the power supply to energize the LED light source;
• and
• attaching a lens to the reflector to receive light from the LED light source at least one of directly or as reflected by the reflector, wherein the lens further comprises an entry surface including a plurality of concentric rings having non-vertical sides.

A lighting system comprising:

• an LED light source of size S;
• a reflector to reflect at least a portion of the light from the LED light source;
• and
• a lens disposed to receive the light from the LED light source, the lens having a diameter LD, where the ratio LD/S is from about 20% to about 60% smaller than that achieved with a reflective optical system while maintaining a constant beam angle.

A lighting system comprising:

• an LED light source of size S;
• a reflector to reflect at least a portion of the light from the LED light source;
• and
• a lens disposed to receive the light from the LED light source, the lens having a diameter LD, where the ratio LD/S is between about 8:1 and 4:1 for a beam angle from about 10° to about 15°.