I have used a car battery with 12 volt recreational vehicle 40 wat bulbs, put into a “pinch grip” work lamp fixture… clamps on anywhere. An extention cord (female end) cut short hooks to the leads on the battery…. and a long regular cord on the lamp fixture plugs into it. I have two of these in a shelter run from the same battery. They have a cut off switch on the fixture and a reflector dome on top which keeps light out of your eyes, if positioned low… mostly, I keep them positioned overhead.
“Hoggie”