| Diagram | Fig. 21 — ELECTRICAL EQUIPMENT (Plate 14) · ref 23 |
| Listed in parts books | 1969–1973 |
BULB HEAD LAMP 12V 45/40W
Lucas 410 12V 45/40W dual-filament headlamp bulb for glass reflector units, later renumbered 410L.
This is the Lucas 410 headlamp bulb, a 12 volt dual-filament unit rated 45/40 watts, used in glass reflector headlight units with the standard three-pronged bulb base. It runs the high beam off the 45 watt filament and the dip beam off the 40 watt filament, with the switch handled at the handlebar switchgear rather than at the bulb.
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The factory later renumbered this bulb as 410L, so if your parts book or old box shows 410 or 410L, you're looking at the same physical bulb. It's a straightforward wear item worth keeping a spare of in the toolkit since headlamp bulbs have a way of blowing at the worst possible time.
We don't have extensive catalog history on this one beyond the basic listing, but the spec is clear: 12V, 45/40W, dual filament, glass reflector fitment.
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