New light sources and clear lens design have a big influence on the design of modern signalling lamps and vehicle styling. Discussions in the international working groups have shown a number of doubts in relation of the benefits for the road safety in connection with the new technical possibilities. The existing requirements in the Regulations show a good correlation of the photometric specifications in relation to the conspicuity of the signalling lamps under clear night time conditions. This would be different at day time situation or at adverse weather conditions. Especially at bright sunny days the ratio of luminance of the signal to the surrounding luminance could be relative small, which increases the reaction time. This could reach a critical value, if the part of reflected sunlight on the surface of the signaling lamp becomes significant. For the general day time situation, the ECE Regulation No. 6 (direction indicator) and No. 7 (stop lamp) allow the opportunity of designing lamps with day/night time levels. The problem of colour washout of a signal in the case of low solar altitude remains the same. This effect could generate for example at traffic signals non activated signals, so called 'phantoms' or, at activated signals, the colour will be 'washed out' by the mixture of the signal light and the superimposed reflected light generated by the sun light. In the case of vehicle lighting the 'washout' reduces the conspicuity of a signal strongly. The influence of this 'washout effect' depends on the optical lamp design. The discussion about this effect was raised on during the discussion in GRE about incandescent lamps with red coloured outer bulbs and continued by the discussion on clear lens design for rear signaling lamps. This results in the request for a test procedure, which will take into account this effect. This presentation gives a first overview about the proposed test procedure, the conditions of acceptance and current results.
Colour washout test procedure for signalling lamps
Farben-Washout-Prüfverfahren für Signalleuchten
2005
15 Seiten, 3 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
Engineering Index Backfile | 1932
Optimal luminance contrast of vehicle signalling lamps
Tema Archiv | 2009
|Specification for electric lamps for railway signalling
Engineering Index Backfile | 1960
Engineering Index Backfile | 1933
Visualization of light signal of vehicle signalling lamps
Tema Archiv | 1995
|