Idea for HPS light for potato barrel

The Habitat for Humanity ReStore, closed at 5 today.  So, I wasn't able to pick up the light.  I did price some extension cords at Lowe's.  I thought we should splice a smaller cord for the light then plug it into our extension cord.  That way we are not ruining our 50 ft. extension cable, and can use it for other things.  Looks like we can get one for under $20.