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Wouldn't regular glass do just fine? I've been using it for a long while now, and nothing bad has ever happened.
Although, if I had to choose, I would go with Thaumcraft glass (forgot what it was called) since it just looks sexy imo
No, regular glass breaks when struck by lightning. Found that out the hard way when all my pigs got turned into Zombie Pigmen after a lightning strike and their pen was shielded by glass.
As far as I understand it, Thaumcraft lightning isn't actually lightning
It doesn't set things on fire for one.
So I would imagine your glass roof would be ok to have, but you may still get struck by lightning regardless if you're under it or not (It is an anomaly after all)