| Diagram | Fig. 25 — ELECTRICAL EQUIPMENT · ref 9 |
| Subsystem | electrical |
| Listed in parts books | 1963–1964, 1966–1967 |
Bulb (24/24W. Pre-focus)
Lucas 24/24W pre-focus headlamp bulb for A.C. magneto direct lighting setups.
This is the headlamp bulb Lucas listed for the A.C. magneto direct lighting setup, rated 24/24W in a pre-focus base. The catalog places it right in the electrical equipment and A.C. magneto lighting figures, so it's the main lamp in bikes running the magneto-based direct lighting system rather than a battery-and-alternator circuit.
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A pre-focus base means the filament is set at a fixed position in the bulb holder, which matters for a headlamp beam that has to stay aimed properly. The 24/24W rating tells you it's a dual-filament bulb, giving you a main and a secondary beam off the one bulb, both filaments the same wattage.
Our records show this one turning up across catalog listings from 1963 into 1967 tied to the A.C. magneto ignition and direct lighting figures. If you're not sure whether your bike runs magneto direct lighting or a later battery system, check your wiring and lighting setup before ordering, since the bulb base and rating won't be right for every system out there.
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