Document ID: chunk:federal_register_of_legislation:F2024C00148:reg:1:p32
Version: federal_register_of_legislation:F2024C00148
Segment Type: reg
Provision Reference: reg 1 (pt 32/34)
Character Range: 223376–226176

separated by 1.3 m. This results in a luminance of 275,000 cd/m2. For laboratory evaluation purposes the light sources shall be adjusted to have a luminance within the range of 250,000 to 300,000 cd/m2 by using a constant current source.

              For laboratory evaluation purpose a shorter distance than 250 m can be used.

              The distance aPLS from the camera entrance pupil to the point light source lab model shall be within the depth of field of the camera. The point light source lab model shall be adjusted to the measuring distance aPLS in terms of lamp size dPLS and distance SDPLS. The value for dPLS and SDPLS shall be rounded to the nearest 0.1 mm.

              A typical white LED having a correlated colour temperature of 6,500 K with a tolerance of ± 1,500 K is used for this evaluation. The emitting surface of the LED shall keep an even luminance or it shall be diffused using an optional diffuser as shown in Figure 1.

              The angular size corresponding to the headlamp of 0.09 m diameter and the angular orientation of the two point light source separated by 1.3 m of each other, at 250 m distance, are calculated as:

              and
              For example, at 6 m distance from CMS to this emulated LED, the corresponding aperture opening of the LED shall be dPLS = 2.2 mm in diameter and separated by SDPLS = 31.2 mm to emulate the set of passing beam headlamps located 250 m from the CMS.

              Ambient illumination at the point light source lab model and at the monitor-side shall be less than 2 lx.

              The luminance of the LED shall be measured at the same angular direction of the CMS to confirm that light emitted from the aperture delivers the correct luminance.

              The luminance of the rendered point light sources on the monitor is measured by using a reference (luminance) camera according to ISO 16505:2015 providing a sufficient spatial resolution, or equivalent.

              For the evaluation, the CMS shall be switched to the operation mode intended to observe the point light sources.

              Position the camera of the CMS such that its optical axis is aligned to the perpendicular orientation of the point light source lab model (Figure 1). Target the CMS camera to display the point light sources in the middle of the monitor defined size. The distance from the camera entrance pupil to the point light source lab model shall be set to aPLS.

              For determination of the point light source detection factor PLSDF evaluate the luminance profile in horizontal and vertical direction (Figure 2).

              Figure 2
              Luminance profile of the rendered point light sources for the determination of PLSDF
              The point light source detection factor -