I was thinking outside the box when planning my arches, and thought: "Why do I have to wrap the lights around the pole? People only see the lights from the front!"
So after I determined how wide each section/channel of my arch will be, what I did was made a jig out of a scrap piece of wood and 2 4" L-braces screwed into it spaced a bit less than my section width, wrapped the lights around that, and then neatly picked up the wrapped wires, placed them over the arch, and zip-tied them in place.
It still looks good and I saved money on lights in the process. Also, if there is a problem with a light string, I can easily remove and replace it in place.