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 25 L [DEL], 50 R and B 50 L for passing beam (or 25 R [DEL], 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 ballast(s) and those surrounding body parts and lamps which could influence its thermal dissipation. a7c0
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 HV, 50 R and B 50 L for passing beam (or HV, 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 ballast(s) and those surrounding body parts and lamps which could influence its thermal dissipation. a0c0