To ensure maximum benefit from the lens design the lamp should be mounted with the rear face of its cover vertical and facing directly rearward of the car.

To comply with the Road Transport Lighting Act, 1953, two lamps must be positioned as follows:
    (i)      Between 1' 3" and 3' 6" from the ground.
    (ii)     Not more than 2' 6" from the rearmost point of the car.
    (iii)    Not less than 1' 9" apart.
    (iv)    Not more than 2' 0" inboard from the outer edge of the car. (In the interests of uniformity, the figure of 1' 4" as specified for new cars is recommended).

Remove the cover and bulb and mark off three mounting holes on the car. Drill two 3/16 holes for the fixing screws and one hole for the cable.
Pass the rear light and brake light cables through the grommet at the rear of the !amp. Strip off the insulation from the cables for about ", fit the ferrules and make the connections as shown in Fig. 1. Check that the brake switch cable feeds the higher wattage stop-light filament, and the rear light cable feeds the lower wattage filament. Mount the lamp to the car and tighten the securing nuts.

To ensure adequate earthing, connect with a suitable length of cable one of the lamp fixing screws to a good earthing point on the chassis.  Refit the bulb and lens.

Non-reversible bulbs are used to ensure correct illumination of the rear and stop-light filaments.
With 12-volt systems fit: Lucas No. 380 6/21 watt
or Lucas No. 361 6/18 watt

With 6-volt systems fit: Lucas No. 384 6/18 watt