Osram now offer two new motorcycle bulbs to ... They are available as H4 and H7 bulbs. Their distinctive marks are a silver cap and the blue-coated bulb – a real eye-catcher in any motorcycle ...

The H4 twin-filament bulbs we tested appeared in the Sixties, but advanced production methods have allowed firms to push them to the limit. Take Osram’s Night Breaker Plus; it uses filters on ...