Headlamps

8″ diameter headlamps were used up to the war when they were changed to a more economical 6″ (with blackout masks it did not really matter what was under the hood). 7″ units were introduced after the war as supplies became available. All headlamps up to 1949 have a main bulb holder that is adjustable so that the bulb may be focused, after this date the ‘British Pre-Focus’ or BPF bulb was introduced. The earlier bulb we refer to as the ‘pre-pre-focus’! The sizes of headlamp listed below are those given by Lucas and are as measured across the opening in the shell, the 7 1/2″ one is more commonly known as 8″.

If you have a pre 1949 headlamp it is important to identify whether your hedlamps is for a flat or dome glass as the shell, glass, rim and catches are not interchangeable. Lucas headlamp model codes explained! Prefixes: M= dome glass with cast clip; D=flat glass and sheet metal clip; U=instrument panel; 42=6”; 142=7 ½” (8”); 575=5 ¾”; 700=7”. There are exceptions! Shells, rims, clips, glasses and rims are not interchangeable. The model will usually be found stamped into the shell, near the rim at the bottom.