Abstract
The problem of obtaining reasonable night-time seeing conditions when meeting oncoming traffic demands the use of uniform meeting-beam intensities. Variations will exist, and can be tolerated provided they are not too great or too frequent. The sources of variation relevant to the problem have been examined and the necessary degree of control stated.
At present lamp-aiming errors swamp all other variations. If these aiming errors can be reduced considerable improvement will be possible with existing equipment: by following the trends in aiming accuracy the need for lower lamp production variations and even better control of voltage may be established.
The immediate objective is stated as an improvement in aiming followed by a movement towards a higher degree of control of aiming, lamp production and voltage variation.
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