In natural light it appears brighter, the second photo was taken outside just before this post was written.
The only positive for application is that it dries quickly, you can see in the first photo that it dries to a semi-matte finish, as most neons do, so that wasn't a problem. But this was 4 coats! And if I look closely it still looks a bit patchy in places :( I would expect this of a sheer, but not a neon. Poor form Essie!
It's a lovely colour and does just about manage to make up for its poor application, but only just.