RI, I do know of Escort lighting. Please send me a pic of this project, and I will be happy to take a look. 18 path lights? That sounds like way too many. As long as there are tall trees in the area, I would go that way. Remember, when you attach the wire to the trees, use zip ties instead of staples. The zip ties with the hole at the end will allow the wire to move a little as the tree grows and sways. You also have to check it every year to make sure that the tree does not grow around the wire. Use stainless steel screws as well, this will not harm the tree.