Spotlights, torches, lights on a tractor, all types of artificial lighting.
I suppose it depends on the task they are undertaking.
I don't know what you are getting at.
An answer after 5 requests.
Torches are no good as they would need both hands free.
Spotlights. You mean like football stadiums have? None of those in Goldhanger or TD.
Do you agree a helmet with a light on is practical? They were easy to obrain and had been used for decades by thousands of people in other industries. I gave you a source of a farmer using one.
First request.