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ISO 6742-1-2015 pdf free download

ISO 6742-1-2015 pdf free download.Cycles Lighting and retroreflective devices Part 1:Lighting and light signalling devices
Cycles — Eclairage et dispositifs rétro-réfléchissants — Partie 1: Equipernents de signalisation et d’éclairage.
6 Test methods
6.1 General
During photometric measurements, stray reflections shall be prevented by appropriate masking.
In all cases, the distance of measurements shall be such that the law of the inverse of the square of the
distance is applicable.
For all values expressed in lux, the measurements are performed on a vertical screen P fitted 10 m in front of the lamp. If the distance of measurement is different than 10 m, the result of measurements shall be expressed at 10 m following the law of the inverse of the square of the distance. The measuring equipment shall be such that the angular aperture of the receiver viewed from the reference centre of the lamp is between 10, and 10.
The intensity requirement for a particular direction of observation shall be deemed to be satisfied if that requirement is met in a direction deviating by not more than 15’ from the direction of observation.
For any lamps, except those equipped with filament lamps, the luminous intensities and colour measured after I mm and after 30 mm of operation shall comply with the requirements. The luminous intensity distribution after one minute of operation can be calculated from the luminous intensity distribution after 30 mm of operation by applying at each test point the ratio of luminous intensities measured at H = V = 00 after 1 mm and after 30 mm of operation.
In case of short pulses, the effective intensity of flashing light shall be measured according to AnnxA.
If a lamp has flashing and continuous modes provided by the same light source(s), Its performance shall be measured mainly in continuous mode. The intensity in flashing mode shall be measured only in reference axis, with flashing intensities in other directions calculated in proportion to the continuous intensity in those directions compared to reference axis.
The LED colour shall be measured according to test method described in CIE 1931.ISO 6742-1-2015 pdf free download.

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