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Once the photometric values have been measured according to the prescriptions of this Regulation, in the point for Imax for driving-beam and in
points 25L, 50 R, B 50 L for passing-beam (or 25R, 50 L, B 50 R for headlamps designed for left-hand traffic) a complete headlamp sample shall be tested for stability of photometric performance in operation. "Complete headlamp" shall be understood to mean the complete lamp itself including those surrounding body parts and lamps which could influence its thermal dissipation.
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