The present invention relates to a surface radiator (100) comprising a light-emitting
semiconductor component (2) and a housing body (1). The housing body (1) has at least one
cooling channel (10, 11) for
coolant, which forms part of a fluid path (a), which extends from an inlet opening (3) to a return opening (4) on the housing body (1). An emission window (5) is arranged thereon, which overlies the light-emitting
semiconductor component (2) and which defines a front side of the surface radiator (100) and which is transparent for an incident
radiation (S) that can be emitted by the
semiconductor component (2). The housing body (1) provides an attachment surface (12) spaced apart from the emission window (5) for the at least one light-emitting semiconductor component (2). The arrangement of the emission window (2) on the housing body (1) is formed in a fluid-tight manner and the housing body (1), the semiconductor component (2) and the emission window (5) delimit an emission chamber (6). The fluid path (a) is defined by i) at least one first
cooling channel (10), which extends from the inlet opening (3) through the housing body (1) to an orifice opening (13), and ii) the emission chamber (6), and iii) at least one second
cooling channel (11), which extends from the
discharge opening (14) through the housing body (1) to the return opening (4). The
coolant (K) is an electrically insulating liquid, which is transparent for the incident
radiation (S).