An optical component, comprising: a light-transmitting body having a light output surface; a first optical unit disposed on a bottom side of the light-transmitting body, wherein the first optical unit has a light input surface and a plurality of surrounding structures surrounding the light input surface and arranged in a pattern of concentric circles, and each surrounding structure has a first surrounding surface and a second surrounding surface connected to the first surrounding surface; and a second optical unit disposed on a top side of the light-transmitting body, wherein the second optical unit has a spiral structure surrounding the light output surface of the light-transmitting body and a surrounding frame surrounding the light output surface of the light-transmitting body and the spiral structure, and a relative height (dl, d2, d3, d4) from a topmost surface of the spiral structure to the Light output surface of the light-transmitting body is increased gradually from inner to outer; wherein a main light beam generated by a light-emitting module when disposed under the light input surface of the first optical unit passes the first surrounding surface of each surrounding structure and is reflected by the second surrounding surface of each surrounding structure, to form a main projection light source passing through the Light output surface of the Light-transmitting body; wherein an area of the light output surface of the light-transmitting body is larger than an area of the light input surface of the first optical unit right above the light-emitting module, and an area of a top surface of the spiral structure is smaller than the area of the light output surface of the light-transmitting body. a light-transmitting body having a light output surface; a first optical unit disposed on a bottom side of the light-transmitting body, wherein the first optical unit has a light input surface and a plurality of surrounding structures surrounding the light input surface and arranged in a pattern of concentric circles, and each surrounding structure has a first surrounding surface and a second surrounding surface connected to the first surrounding surface; and a second optical unit disposed on a top side of the light-transmitting body, wherein the second optical unit has a spiral structure surrounding the light output surface of the light-transmitting body and a surrounding frame surrounding the light output surface of the light-transmitting body and the spiral structure, and a relative height (dl, d2, d3, d4) from a topmost surface of the spiral structure to the Light output surface of the light-transmitting body is increased gradually from inner to outer; wherein a main light beam generated by a light-emitting module when disposed under the light input surface of the first optical unit passes the first surrounding surface of each surrounding structure and is reflected by the second surrounding surface of each surrounding structure, to form a main projection light source passing through the Light output surface of the Light-transmitting body; wherein an area of the light output surface of the light-transmitting body is larger than an area of the light input surface of the first optical unit right above the light-emitting module, and an area of a top surface of the spiral structure is smaller than the area of the light output surface of the light-transmitting body.