1.2 Headlamps

Information Method of Inspection Reason for rejection
Headlamps are lamps used to illuminate the road ahead of the vehicle, but are not fog lamps. This inspection applies to: All obligatory headlamps fitted. This inspection does not apply to: Vehicles used only during the hours of daylight, which are not fitted with front or rear position lamps, etc (see 1.1) Note: Headlamps are not required on vehicles first used before 1 January 1931, but they may have one or more optional main or dipped beam headlamps. 1. Check that the vehicle is fitted with obligatory headlamps, as follows 1. a missing or insecure obligatory headlamp.
Note: Class 3 vehicles may not require two headlamps (matched pair)
a. a matched pair of main- beam headlamps, and  
b. a matched pair of dipped-beam headlamps Note: Main-beam and dipped-beam functions may be provided by a single pair of headlamps.  
2. Check the presence, condition, security and operation of the switch. 2. A missing, faulty or insecure switch.
'Matched pair'
A 'matched pair' is a pair of lamps which Both emit light of substantially the same colour and intensity, and  Are both the same size and shape, so that they are symmetrical to one another. 3. Switch on each main-beam headlamp and check that all main beams are switched off by one switch (dip switch) which leaves a matched pair of dipped beam headlamps switched on, or  the main beam headlamp reflectors are deflected by a driver's control, to make them dipped beams. 3.  a. A headlamp does not operate immediately when selected on dipped beam or on main beam
  b. Operation of the dip switch does not extinguish all main beam headlamps, and leave on at least one pair of dipped beam headlamps, or deflect the main beams to make them dipped beams
Class 3 Vehicle
Vehicles first used: Before 1 January 1972, or On or after 1 January 1972 with an unladen weight of 400kg or less, and an overall width of 1300mm or less require only one headlamp. Note: Pre 1 January 1931 vehicles For vehicles that are fitted with one or two optional headlamps: where one is fitted it must dip where two are fitted, either both must dip or one must dip and the other switches off  
Headlamp aim
see 1.6 for the inspection of headlamp aim.   4. Check that each obligatory headlamp a. is in good working order Note: Any adverse effects due to headlamp lens damage or deterioration can also be assessed on checking beam aim (see 1.6). A repaired lens must be assessed on its merits 4. An obligatory main or dipped beam headlamp a. not in good working and in clean condition, ie damaged or deteriorated to such an extent that the light output is well below that required to illuminate the road ahead, or the beam image is adversely affected
b. is secure b. insecure
c. does not flicker or extinguish when tapped lightly by hand c. flickers or extinguishes when tapped lightly by hand
d. if intended to be one of a matched pair emits light of substantially the same colour as its counterpart (either white or yellow) Note: in a four headlamp system the outer pair of headlamps need not emit the same colour light as the inner pair. is the same size is correctly positioned Note: The measurement of the precise position of headlamps is not part of the inspection, but check visually that the lamps, are at about the same height, and the same distance inboard from the side of the vehicle d. the headlamps provided to form a matched pair do not emit light of the same colour are not the same size are obviously not correctly positioned
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