ISO 6742-1:2015 pdf download – Cycles — Lighting and retro-reflective devices – Part 1: Lighting and light signalling devices
ISO 6742-1:2015 pdf download – Cycles — Lighting and retro-reflective devices – Part 1: Lighting and light signalling devices.
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. lithe distance of measurement is different than 10 m. the result of measurements shall be expressed at 10 m followrng 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 l.
The intensity requirement for a particular direction of observation shall be deemed to be satisfied ii 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 1 mm and after 30 mm of operation shall comply with the requirements. The luminous intensity distribution alter 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 0 alter I mm and after 30 mm of operation.
In case of short pulses, the effective intensity of flashing light shall be measured according to AnnexA.
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.
6.2 Power supply and light source to test photometrical performances
Thelamp shall beequipped with the lightsources specified by the manutacturerand operatedat its reference luminous flux, for the voltage specified by the manufacturer according to Iso 6742-4 and ISO 6742-5.
For lighting devices working with power supplied by cycle’s movement defined in ISO 6742-4, Clause 4, it’s possible to use DC or AC power supply as described below:
a) Lighting devices with LED
Test voltage 6 V; the Current shall not exceed:
1) fur 2.4W headlamps (for 3 W / 2,4W — systems): 440 mA;
2) for 1,2 W headlamps (for 1,5 W — system): 220 mA;
3) for 0,6W rear lamps (for 3W – system): 110 mA;
4) for 0.3 W rear lamps (for 1,5W – system): 55 mA, Akernatively the devices can be measured with test current:
1) for 2,4 W headlamps (for 3 W / 2,4W systems): 400 mA;
2) for 1.2 W head lamps (for 1,5W — system): 200 mA;
3) for 0.6 W rear lamps (for 3 W – system): 100 mA;
4) for 0.3 W rear lamps (for 1.5 W — system): 50 mA. The voltage shall not exceed 6,7 V.
b) Lighting devices with filament bulbs
1) changeable filament lamp: luminous flux according to lamp data sheet;
2) non-changeable lamp: 6 V.
6.3 Installation on test bench
The lamp shall be installed on the test bench according to the recommendations of the cycle manufacturer or. those of the constructor of the lamp.
During the measurements the light shall be lit in accordance with the manufacturer.
If this is not clearly defined in the instruction manual there are two possibilities:
— H-H is the line where the illumination on this line and above is not higher than 2 lx;
— H-H Is the line 3,5 • above Emax.
NOTE Values in lux measured on a vertical wall at 10 m ahead trom headlamp.