Document ID: chunk:federal_register_of_legislation:F2023C00165:front:0:p8
Version: federal_register_of_legislation:F2023C00165
Segment Type: other
Provision Reference: 
Character Range: 20715–23442

outer bulb shall be at least 85% of the specified luminous flux of the relevant filament lamp with colourless bulb.

3.5. Filament position and dimensions

3.5.1. The geometric shapes of the filaments shall in principle be as specified on the lamp data sheets of annex 1.
3.5.2. For line filaments the correct position and shape shall be checked as specified in the relevant data sheets.
3.5.3. If the filament is shown on the lamp data sheet in at least one view as a point, the position of the luminous centre shall be determined in conformity with annex 4.
3.5.4. The length of a line filament shall be determined by its ends, defined - unless otherwise specified on the relevant data sheet - as the apices of the first and the last filament turn as seen in projection perpendicular to the reference axis of the lamp. Such an apex shall comply with the requirement that the angle formed by the legs shall not exceed 90 degrees. In the case of coiled-coil filaments the apices of the secondary turns shall be taken into account.
3.5.4.1. For axial filaments the extreme position of the apices considered shall be determined by rotating the filament lamp about its reference axis. The length shall then be measured in a direction parallel to the reference axis.
3.5.4.2. For transverse filaments the filament axis shall be placed perpendicular to the direction of projection. The length shall be measured in a direction perpendicular to the reference axis.

3.6. Colour

3.6.1. The bulb of the filament lamp shall be colourless, 5/ unless otherwise prescribed on the relevant data sheet.
3.6.2. The colorimetric characteristics, expressed in CIE chromaticity coordinates, shall lie within the following limits: finished filament lamps with selective yellow bulb or outer bulb

        limit towards red: y > 0.138 + 0.580x;

        limit towards green: y < 1.29x - 0.100;

        limit towards white: y > -x + 0.966;

(y > -x + 0.940 and y = 0.440 for front fog lamps);

        limit towards spectral value: y < -x + 0.992;
        finished filament lamps with amber bulb

    5/ A bulb is considered to be colourless if it does not appreciably alter the trichromatic coordinates of a luminous source having a colour temperature of 2,856K.

        limit towards red y > 0.398

        limit towards green y < 0.429

        limit towards white z < 0.007

3.6.3. The colour and the transmission of the bulb of filament lamps emitting coloured light shall be measured by the method specified in annex 5.

3.7. The UV radiation of a halogen filament lamp shall be such that:

where: Ee (lamda) [W/nm] is the spectral distribution of the radiant flux; V (lamda) [l] is the spectral luminous efficiency;

              lamda