An automatic vehicle headlamp dimming system which includes an optical system and an imaging processing system. 15 mgmm3 of mercury, a rare gas, and a halogen in the range from 1\xd710\u22126 \u03bcmolemm3 to 1\xd710\u22122 \u03bcmolemm3, by at least one of the electrodes having a melt part formed toward the electrode tip by winding the electrode rod with a coil and by melting the part of the coil oriented towards the electrode tip at least in the area of its surface. The second phase-locked loop utilizes the first phase-locked loop output signal during operation in the holdover mode to generate the output clock and utilizes the reference clock during normal operational mode to generate the output clock. All MPOA devices for which a Data Direct VC was released delete all LE_ARP cache entries associated with the ATM destination of the released Data Direct VC. The algorithm for edge detection can be based on directional or non-directional spatial filters.