Lamp arrangement

A lamp arrangement (800) having a casing (801) of the lamp arrangement, a cooling arrangement (814) and a light source unit (809), which light source unit has a casing (807) of the light source unit, a light source (805), an elongated piece (811) made at least partially of heat-conducting material, to the side of which the light source is attached such that the light source is separate from the rear reflector, which elongated piece has a first end (816) and a second end (817), and the light source unit further has a cooling channel (808) for cooling substance in said elongated piece, and the opening of the cooling channel is in the first end of the elongated piece, and in the protective surface is an opening to the first end of the elongated piece such that the opening of the cooling channel is arranged to take cooling substance from outside the area delimited by the protective surface, and at the site of the light source is attached a reflective surface (806), which is arranged to reflect light in the direction of illumination, and the reflective surface is arranged to form an opening (813), and between the casing of the light source unit and the casing of the lamp arrangement is a second cooling channel (802), which is in connection with the cooling arrangement, characterized in that the light source unit (809) has a rear reflector (804), which is arranged to reflect the light of the light source (805) in the illumination direction of the light source unit, and further a protective surface (812), which is translucent and which protective surface is in relation to the light source in the illumination direction of the light source unit, and the protective surface is disposed to protect the inner parts of the light source unit, and that the reflective surface (806) is attached to the heat-conducting elongated piece (811) or to other structures of the light source unit (809), and that the reflective surface (806) is arranged to form an opening (813) in the direction of the rear reflector (804).