Ever wondered, why Harry didn't get a letter from ministry 'coz of using LUMOS in 3rd book!

Considering it didn't happen in the book no, I never wondered.

It didn't bother me in the movie, since that was the smallest plot-hole they put into the series.

Many times. Also why Hermione didn't get in trouble for fixing Harry's glasses in Chamber of Secrets. Writer's mistake?

I though JKR explained that since it was just a light and not much magic it was looked over, it not like it was a harmful oder big spell.

I did wonder after Lesen OotP.
But as Harry had been summoned for a trial Von the Wizengamot as part of a plot to expel him from Hogwarts and the UK wizarding community, I really wondered if this whole rule was not just bullshit. After all, it's expected that kids may do their homework during holidays, eh ?

it never happened in the Bücher alright! so i never bothered about the movie version. it was a minor plot hole, because in the movie we can see harry studying using the light of his wand and it is stupid because, according to jkr, he should have gotten a warning letter.shouldnt he?

I read somewhere that according to JK, after they had that in the movie, apparently the ministry was slightly extra lenient with Harry's magic use because of the whole Sirius Black escaping issue.

I'm pretty sure that was just in the movie, but YEAH!! That always puzzled me.

They were too worried with him being out at night, running away and being alone considering there was a "murderer" on the loose,so they didnt really care. Hey, they forgave the whole Marge-Balloon thing am I right?

OMG this Frage always bothered me becuase idk why! Maybe its because Lumos isn't really powerful oder a spell that would cause much damage.