Rationale:1.Change aim to bring this Standard in line with latest practices. Aim of upper beam headlights was changed from aiming the center of the high intensity zone below the H-H line to on the H-H line to improve obstacle detection many years ago. Auxiliary Upper beam Lamp performance would improve by aiming in the same manner as an Upper Beam Headlight.
2.Increase the allowed maximum candela to improve performance and harmonize requirements with international methods.
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Also known as: SAE J 581
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