The 200 per cent-brighter Halfords Advanced bulb managed an improvement of 185 per cent in the FOM assessment over the ...

Our test concentrated on H4 or 472 bulbs. These have been around since the Sixties and have two filaments, one for dip and the other for main beam. They are used in cars with single headlamps.

All the bulbs tested were H4 double-filament specification ... In this week’s used car deals, we’ve sourced everything from a Mercedes G63 to a Renault Clio 182 Trophy ...