Night driving round the ponds and the village streets
The A232 through the village by Carshalton Ponds is narrow and often slow, with buses, pedestrians and parking along it, and the residential links around Carshalton Park Road and Ruskin Road are quieter still. Driving there after dark is all about short-range detail: someone stepping out between parked cars, a cyclist without much in the way of lights, the edge of a kerb on a road where there is no room to spare. That is the work a sharp dipped beam does, and it is the first thing a clouded lens takes away.
Shift patterns add to it. St Helier Hospital on Wrythe Lane is a major local employer, and plenty of people here drive to and from it in the dark for a good part of the year. If your lenses have gone milky or amber, you are starting every one of those journeys with substantially less usable light than the car left the factory with. The lamp is not broken. The thin ultraviolet hard coat on the outside has worn through and the polycarbonate underneath has oxidised.
It is worth knowing where this sits with the MOT. A headlamp deteriorated badly enough to reduce its light output is a defect, and a poor beam pattern gets noted at test, so a badly clouded lens can fail. Restoration often resolves that, but we will not promise you a pass, because the tester judges the lamp and the beam on the day. What we can say is that a lens with surface oxidation and light crazing is usually a straightforward job.
We assess the unit before quoting, mask off the paint, grille and trim, then wet sand through progressively finer grades, machine polish and apply a UV-stable clear coat, checking the beam pattern and aim at the end. It is five minutes from the village, north on West Street and round via Nightingale Road and Hackbridge Road. The coating needs to cure before the car goes out, so we will tell you at booking whether to leave it.