Headlight bulb - Halogen 12v 65/55w P45t. Direct replacement for original headlight bulbs used in Lucas "PL" lamps (416 or 417) with 3 pin plug. These bulbs draw the same power but offer a brighter whiter light than a normal bulb. No changes to lamps or wiring required. Original bulb number: 416, 417 Suits Triumph, BSA late 1960s onwards