What you did was a good thing. If she was a good/nice customer, bite the bullet and eat the cost for some new lights. They're not that expensive. Next time maybe tell these people around clean-up time that if they have stuff like that out, to try and mark the cords or try to prop them up so that you can see them. The damn cable and phone companies do this to me all the time, and these fools that install these lines never mark the lines, and then when we come across them they expect me to pay for the damage, when they never marked the lines. That stuff is hard to see when you're going full bore across an open feild.
