Well, since you're the artist, you are right whatever way to look at it. As for the facts, of course it was created by accident; there's not really a way you can control the light leak. But does that make it any less beautiful? Or does it at all take away from the pleasure of viewing it? I think not. I tend to believe that the mistakes we make, the accidents that happen, are a part of the artwork. That was what I was trying to express in fewer words in my last comment.
Thank you for sharing it as art or error alike; I enjoyed it.