heat is transmitted through the metal core in the printed circuit board 17 directly to the support 1 u2032 or conducted to it in this way the perimeter light 3 and its housing 18 are protected from excessive heat or overheating the cover 2 is pushed over the preassembled optical window 10 during this process the cover 2 slides over the end face 25 of the optical window 10 with elastic expansion until the rim 26 of the opening snaps into the shoulder 24 of the optical window in this way the optical window 10 is braced and held against the carrier 17 hence additional fastening means for the optical window 10 are unnecessary due to the preloading of the light housing 18 the seal 21 is also elastically compressed between the ridge 5 and the housing 18 thus reliably preventing the penetration of moisture into the housing 18 the mirror mounting bracket 71 embodiment shown in fig2 differs from the embodiment described above only in that the light housing 54 has a preferably ring shaped cavity 27 provided between the housing walls 29 29 u2032 and a central midsection 28 this midsection 28 has at its free end a recess 28 u2032 into which the led 16 projects in a form fitting manner in the assembled light housing 54 the optical window 50 has the central protruding housing section 51 which rests in the opening 9 in contrast to the mirror mounting bracket 1 embodiment described above the end face 52 of the central housing section 51.