Document ID: chunk:federal_register_of_legislation:F2023C00165:reg:6v:p15
Version: federal_register_of_legislation:F2023C00165
Segment Type: reg
Provision Reference: reg 6V (pt 15/19)
Character Range: 167315–171551

procedures on sheet H21W/2.
    4/ In the area between the outer legs of the anglesamma 1 and gamma2, the bulb shall have no optically distorting areas and the curvature of the bulb shall have a radius not less than 50% of the actual bulb diameter.
CATEGORY H21W

Sheet H21W/2
Screen projection requirements
This test is used to determine, by checking whether the filament is correctly positioned relative to the reference axis and the reference plane and has an axis perpendicular, within +/- 7.5 degrees, to the plane through the centre line of the reference pin and the reference axis, whether a filament lamp complies with the requirements.

Reference  a        b        h        k
Dimension  d + 1.0  d + 1.0  f + 1.2  0.5

\d = actual filament diameter
f = actual filament length
Test procedures and requirements

l. The filament lamp is placed in a holder capable of being rotated about its axis and having either a calibrated scale or fixed stops corresponding to the angular displacement tolerance limits. The holder is then so rotated that an end view of the filament is seen on the screen on to which the image of the filament is projected. The end view of the filament shall be obtained within the angular displacements tolerance limits.

    2.                  Side elevation

 The filament lamp placed with the cap down, the reference axis vertical and the filament seen end-on, the projection of the filament shall lie entirely within a rectangle of height "a" and width "b", having its centre at the theoretical position of the centre of the filament.

    3.                  Front elevation

 The filament lamp placed with the cap down and the reference axis vertical, the filament lamp being viewed in a direction at right angles to the filament axis:
3.1. The projection of the filament shall lie entirely within a rectangle of height "a" and width "h", having its centre at the theoretical position of the centre of the filament.

3.2. The centre of the filament shall not be offset by more than distance "k" from the
          reference axis.

          CATEGORY W21W

Sheet W21W/1

DIMENSIONS in mm                                                                    Standard
                                                                Filament lamps of   filament
                                                                normal production   lamp

min.                                                            nom.                max.
e                                                                                   29.0                       29.0 -0.3
f                                                                                   2/                         7.5 + 0
                                                                                               7.5             - 2

Lateral deviation 1/                                                                           2/              0.5 max

beta                                                            -15 degrees 2/      0 degrees  +15 degrees 2/  0 degrees +/- 5
                                                                                                               degrees

Cap W 3x16d in accordance with IEC Publ. 61 (sheet 7004-105-2)
ELECTRICAL AND PHOTOMETRIC CHARACTERISTICS
 Rated values                                                   V                              12                                12

W                                                                                   21                         21
 Test voltage                                                   V                              13.5
Objective values                                                W
                                                                +/-%                           25                                25 at 13.5V

                                                                6                              6
Luminous
flux lm                                                                             460
+/- %
                                                                15

 Reference luminous flux: 460lm at approx. 13.5V

    1/ Maximum lateral deviation of filament