gwern comments on Harry Potter and the Methods of Rationality discussion thread, part 19, chapter 88-89 - Less Wrong
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To defend it against anyone with a sunlight-generating spell or who has some acorn potion handy.
In fact, isn't there such a spell used in Canon?
There's 'Lumos' but it's never mentioned as a dead-useful defense against trolls so presumably isn't as good as real sunlight or a sunlight-generating spell.
No, I could swear there was an actual ... maybe in one of the movies?
EDIT: I was thinking of this