A light source 400 for use behind a lens arrangement 36, 38 of a signal aspect 18 of a railway light signal configured to use a filament lamp, wherein the light source is a LED light unit comprising: a LED driver circuit comprising an elongate LED element; and a mechanical support member 404 for supporting the LED driver circuit and the elongate LED element on a component 30, 32 of the signal aspect configured to receive a filament lamp, wherein the elongate LED element substantially replicates the location and orientation and incandescent profile of a filament in the filament lamp for which the signal aspect was configured and wherein the LED driver circuit comprises a dummy ballast load resistor 512 causing the LED light unit to consume substantially the same electric power as the filament lamp for which the signal aspect was configured. The LED light unit is designed to be directly substituted for a filament lamp.


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    Titel :

    Railway light signals


    Beteiligte:

    Erscheinungsdatum :

    18.11.2015


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    H05B ELECTRIC HEATING , Elektrische Heizung / B61L Leiten des Eisenbahnverkehrs , GUIDING RAILWAY TRAFFIC



    Railway signals

    Engineering Index Backfile | 1910


    Railway signals

    Jenkins, Francis C. | Engineering Index Backfile | 1899



    LEDs for railway signals

    British Library Online Contents | 2004


    Prussian state railway signals

    Pockels, W.H. | Engineering Index Backfile | 1907