That's totally possible. Certainly the film's spells are more inspired by the ones in the books, as opposed to a full match. Starry, luminous spells are few and far in between, if ever truly present. However, the books and games certainly have had their share of various spell aesthetics, which are also just as visually valid, so a few effects here and there with fiber-optics would still be highly interesting and intriguing without breaking the visual language of Potter.