Medical headlamp optical arrangement

A lamp having a front surface from which an output light beam having an output light beam width is emitted, comprising:

• (a) a high efficiency light source assembly producing a beam having a 3 dB beam width of greater than or equal to said output light beam width, said assembly having:
• (i) a substrate;
• (ii) a high efficiency light source supported by said substrate;
• and
• (iii) said high efficiency light source being contained in a lens in the form of a dome, positioned in front of and about said high efficiency light source and being supported by and joined to said substrate;
• (b) an optical assembly positioned to receive light from said high efficiency light source and produce a lamp light beam emitted from said front surface of said lamp;
• (c) a housing supporting said high-efficiency light source assembly and said optical assembly and an electrical conductor connected to said high-efficiency light source, for supplying electricity to said light source;
• (d) an annular light block, having a back, defining an annulus and placed on and about said lens, so that said lens protrudes through said annulus;
• (e) whereby some of said light emitted from said high energy light source, but at an angle outside of said output light beam width, strikes said back of said annular light block and is reflected back, away from said front surface, thereby creating a sharp boundary for said output light beam.