Lucas was an old Birmingham England company that got its start making oil lamps for ships, and went on to manufacture lighting systems for bicycles.
They date back to the late 1800s when they made Kerosene and Carbide lamps for bicycles.
When these became obsolete Lucas went on to make battery and dynamo (Generator.) driven bicycle lighting systems.
The company also made generators and other electrical parts for cars and motorcycles.
Lucas also made an inexpensive little mechanical bicycle odometer, called a cyclometer. Introduced in the 1930s, it was popular with club riders and cycle tourists up until about the late 1960s