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A low voltage power supply includes a plurality of output terminal pairs interconnected by electrical circuitry effective to permit individual adjustment of the voltages applied between each such pair for powering simultaneously a plurality of light sources at individually selected voltages. The lig

A low voltage power supply includes a plurality of output terminal pairs interconnected by electrical circuitry effective to permit individual adjustment of the voltages applied between each such pair for powering simultaneously a plurality of light sources at individually selected voltages. The light sources are associated with dental handpieces through umbilical tubings, an exemplary one of which includes a bundle of flexible, light-conducting fibers connected between a first coupling fixture holding a subminiature bulb and a second coupling structurally adapted for connection to a dental handpiece.

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A low voltage power supply includes a plurality of output terminal pairs interconnected by electrical circuitry effective to permit individual adjustment of the voltages applied between each such pair for powering simultaneously a plurality of light sources at individually selected voltages. The lig

A low voltage power supply includes a plurality of output terminal pairs interconnected by electrical circuitry effective to permit individual adjustment of the voltages applied between each such pair for powering simultaneously a plurality of light sources at individually selected voltages. The light sources are associated with dental handpieces through umbilical tubings, an exemplary one of which includes a bundle of flexible, light-conducting fibers connected between a first coupling fixture holding a subminiature bulb and a second coupling structurally adapted for connection to a dental handpiece. ditional reflection surface from said light source to form an additional light beam directed to an additional, predefined region situated upwardly of said upper light/dark boundary, wherein said additional light beam forms a portion of a total light distribution generated by the headlight. 2. The headlight as defined in claim 1, wherein said reflector has a border region, and wherein said reflection element is arranged at said border region. 3. The headlight as defined in claim 1, wherein a fold is present at least at one portion of the transition between said additional reflection surface of said reflection element and said basic reflection surface of said reflector. 4. The headlight as defined in claim 1, wherein said reflector has a border region including a lower portion as considered in said position of use, and wherein said reflection element is arranged at said lower portion of said border region and a fold is present at least at an upper portion of the transition between said additional reflection element and said basic reflection surface of said reflector. 5. The headlight as defined in claim 1, wherein said additional reflection surface of said reflection element is at least substantially planar. 6. The headlight as defined in claim 1, wherein said additional reflection surface of said reflection element is concavely curved. 7. The headlight as defined in claim 1, wherein said additional reflection surface of said reflection element has a width and a height in the horizontal and vertical directions, respectively, as considered in said position of use, said width being greater than said height. 8. The headlight as defined in claim 1, wherein said additional reflection surface of said reflection element is so configured that the light emitted by said light source and reaching the same is reflected therefrom as a light beam that is horizontally dispersed as considered in said position of use.