I gave my Mom's bike the reflective treatment too. She didn't want the finish to be hidden by a complete wrap, so I stuck with narrow strips. As you see, you don't need to completly wrap a bike with retroreflective films (and possibly muck up a nice finish), to get a nice
result.
Daylight photo after I applied the films
And the results.
I highly doubt that anyone can even notice the difference, unless they saw her bike next to another one of the same year/model.