Document ID: chunk:federal_register_of_legislation:F2023C00228:reg:1:p11
Version: federal_register_of_legislation:F2023C00228
Segment Type: reg
Provision Reference: reg 1 (pt 11/40)
Character Range: 367579–370200

HL and HR: points on "hh" located at 1.125 m to the left and to the right of point HV respectively.
[2/]
[1/] Should two filaments be simultaneously lit when headlamp flashing is used, this shall not be considered as being normal use of both filaments simultaneously.
2/ When the tested headlamp is grouped and/or reciprocally incorporated with signalling lamps, the latter shall be     lit for the duration of the test.  In the case of a direction indicator lamp, it shall be lit in flashing operation mode with an on/off time ratio of approximately one to one.
[3/] NaCMC represents the sodium salt of carboxymethylcellulose, customarily referred to as CMC.  The NaCMC used in the dirt mixture shall have a degree of substitution (DS) of 0.6-0.7 and a viscosity of 200-300 cP for a 2% solution at 20 degrees C.
[4/] The tolerance of quantity is due to the necessity of obtaining a dirt that correctly spreads out on all the plastic lens.
[5/] 50 V is situated 375 mm below HV on the vertical line v-v on the screen at 25 m distance.
[1/] For L2 it is recommended to use a focal distance of about 80 mm.
[10/] See the corresponding footnote in the text of the Regulation.
[1/] Nothing in this Regulation shall prevent a Party to the Agreement applying this Regulation from prohibiting the combination of a headlamp incorporating a lens of plastic material approved under this Regulation with a mechanical headlamp-cleaning device (with wipers).
[2/] Type of lamp" ("lamp type") should not be confused with "category of lamp" ("lamp category").  This Regulation concerns headlamps using halogen filament lamps of categories H1, H2, H3, HB3, HB4, H7, H8, H9, HIR1 and/    or HIR2.  These categories of filament lamps differ essentially in their design and, more particularly, in the cap. They are not interchangeable, but within one filament lamp category there may normally be several types.
[*/] HIR1, HIR2, and H9 lamps will not be used to produce passing beam as long as there was no general agreement on the use of levelling devices and headlamp cleaners with respect to the level of the luminous flux.
[3/] Application for approval of a filament lamp: see Regulation No. 37.
[4/] In the case of headlamps designed to meet the requirements of traffic moving on one side of the road only (either right or left), it is further recommended that the area which can be occulted to prevent discomfort to users in a country where traffic moves on the side of the road opposite to that of the country for which the headlamp was designed should be outlined indelibly on the front lens.  This marking is not necessary, however,