Several years' co-operation among private-sector manufacturers of street lamps and luminaires has led to a development giving more efficient light distribution over a longer period with lamp-post spacing extended to 90-100 m over appropriate carriageway surfaces. The criteria considered are average brightness at ground level, longitudinal uniformity in each traffic lane, average and transverse uniformities, and dazzle limitation. Reasons for early adoption of low-pressure sodium vapour lamps are set out. Modifications in pursuit of energy economy are related to Belgian Government measures aimed at cost-cutting with minimal impact on safety. Calculation and measurement of a 'threshold increment' quantifying dazzle from light sources within the field of vision are discussed. The innovative luminaire is illustrated and described with reference to its optical system, lamp and power supply circuit. Possible modulation according to traffic density is considered, but doubt is cast on its economic value. The annual running cost of the installation is estimated at 58% of that of a conventional one, whose performance is tabulated for comparison.


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    Title :

    Innovation with regard to highway lighting: the TX project


    Additional title:

    Eine Innovation hinsichtlich der Autobahnbeleuchtung: das TX-Projekt


    Contributors:

    Published in:

    Revue E ; 107 , 3 ; 32-39


    Publication date :

    1991


    Size :

    8 Seiten, 6 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    French




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