Neon needs a single line, not an outline
This is the difference that catches everyone. Most vector conversion produces outlines: the shape of a letter, described by its two edges. A neon or LED-flex run needs a centreline: one continuous path down the middle of the stroke, because the tube or the flex follows that path.
Hand an outline to a bender and you have described the silhouette of a letter, not the route through it. On an LED-flex channel job you end up with a groove shaped like the outside of the letter and nothing to seat the flex in.
So the question to ask of a converted file is not whether it looks right, but whether it is one path or two. Trace the letter O: an outline gives you two concentric circles, a centreline gives you one.


