A light head for a medical device support system, comprising a housing base including a plurality of light emitting elements; an annular shape first lens that has a rotation axis; axis (A-A); a housing cover including a cavity within which the annular shape first lens is rotatable about the rotation axis (A-A); wherein the housing cover includes a second lens; wherein the annular shape first lens and the second lens are in a light emitting path of the plurality of light emitting elements, and the annular shape first lens is positioned between the light emitting elements and the second lens; a motion transfer member configured to movably interact with a boss of the annular shape first lens to rotate the annular shape first lens about the rotation axis (A-A) and within the cavity; wherein the annular shape first lens has a first wavy surface and the second lens has a second wavy surface, and wherein rotation of the annular shape lens and its first wavy surface i relative to the second lens and its second wavy surface results in adjusting spreading of the light emitted by the light emitting elements; or wherein the annular shape first lens has a first wedge-shape surface and the second lens has a second wedge-shape surface, and wherein rotation of the annular shape first lens and its first wedge-shape surface relative to the second lens and its second wedge-shape surface results in adjusting bending of the light emitted by the light emitting elements; or wherein the annular shape first lens has a first wedge-shape surface and a first wavy surface and the second lens has a second wedge-shape surface and a second wavy surface, and wherein rotation of the annular shape first lens and its first wedge-shape surface and first wavy surface relative to the second lens and its second wedge-shape surface and second wavy surface results in adjusting spreading and bending of the light emitted by the light emitting elements; and wherein a periphery of the annular shape first lens i includes guide members (84,88) configured to position the boss of the annular shape first lens to movably interact with the motion transfer member. a housing base including a plurality of light emitting elements; an annular shape first lens that has a rotation axis; axis (A-A); a housing cover including a cavity within which the annular shape first lens is rotatable about the rotation axis (A-A); wherein the housing cover includes a second lens; wherein the annular shape first lens and the second lens are in a light emitting path of the plurality of light emitting elements, and the annular shape first lens is positioned between the light emitting elements and the second lens; a motion transfer member configured to movably interact with a boss of the annular shape first lens to rotate the annular shape first lens about the rotation axis (A-A) and within the cavity; wherein the annular shape first lens has a first wavy surface and the second lens has a second wavy surface, and wherein rotation of the annular shape lens and its first wavy surface i relative to the second lens and its second wavy surface results in adjusting spreading of the light emitted by the light emitting elements; or wherein the annular shape first lens has a first wedge-shape surface and the second lens has a second wedge-shape surface, and wherein rotation of the annular shape first lens and its first wedge-shape surface relative to the second lens and its second wedge-shape surface results in adjusting bending of the light emitted by the light emitting elements; or wherein the annular shape first lens has a first wedge-shape surface and a first wavy surface and the second lens has a second wedge-shape surface and a second wavy surface, and wherein rotation of the annular shape first lens and its first wedge-shape surface and first wavy surface relative to the second lens and its second wedge-shape surface and second wavy surface results in adjusting spreading and bending of the light emitted by the light emitting elements; and wherein a periphery of the annular shape first lens i includes guide members (84,88) configured to position the boss of the annular shape first lens to movably interact with the motion transfer member.