System, comprising - a holder for fastening a luminous body to a ceiling element or to a wall element , comprising a substantially cylindrical base body which extends along a longitudinal axis from a base body start to a base body end and has an outer lateral surface , wherein an element for adjustable fixing in the direction of the longitudinal axis is arranged on the outer lateral surface , in particular an external thread , wherein at least one filler element is arranged in the region of the base body end , which filler element projects from the base body in a first direction , wherein the first direction has at least one directional component, which directional component lies in a normal plane disposed perpendicularly to the longitudinal axis , wherein the holder further comprises at least one plate element , wherein the plate element has a, preferably cylindrical, opening , in which opening the base body is held by means of the element for adjustable fixing in the direction of the longitudinal axis , in particular by means of the external thread by a screw connection, and - at least one luminous body , wherein the luminous body can be arranged in an interior of the base body in a detachable manner, in particular in a detachable manner without tools, characterized in that the holder comprises at least one cooling element and at least one connection board for an electrical connection of the luminous body , wherein the cooling element is connected to the base body in the region of the base body start , and wherein the cooling element has a larger diameter perpendicular to the longitudinal axis than the opening , and in that the at least one luminous body comprises a circuit board , in particular a circuit board having at least one light-emitting diode, which circuit board can be placed in a corresponding recess of the connection board and can be contacted with the cooling element . - a holder for fastening a luminous body to a ceiling element or to a wall element , comprising a substantially cylindrical base body which extends along a longitudinal axis from a base body start to a base body end and has an outer lateral surface , wherein an element for adjustable fixing in the direction of the longitudinal axis is arranged on the outer lateral surface , in particular an external thread , wherein at least one filler element is arranged in the region of the base body end , which filler element projects from the base body in a first direction , wherein the first direction has at least one directional component, which directional component lies in a normal plane disposed perpendicularly to the longitudinal axis , wherein the holder further comprises at least one plate element , wherein the plate element has a, preferably cylindrical, opening , in which opening the base body is held by means of the element for adjustable fixing in the direction of the longitudinal axis , in particular by means of the external thread by a screw connection, and - at least one luminous body , wherein the luminous body can be arranged in an interior of the base body in a detachable manner, in particular in a detachable manner without tools, the holder comprises at least one cooling element and at least one connection board for an electrical connection of the luminous body , wherein the cooling element is connected to the base body in the region of the base body start , and wherein the cooling element has a larger diameter perpendicular to the longitudinal axis than the opening , and in that the at least one luminous body comprises a circuit board , in particular a circuit board having at least one light-emitting diode, which circuit board can be placed in a corresponding recess of the connection board and can be contacted with the cooling element . <EOS>