OK, I was thinking of the clamps you get for music stands (which is what most of the "book lights" actually started life as!); some of those have pretty "ferocious" clamps on them.
The screen's pretty tough plastic; must have been something quite sharp to scratch it. These things do happen though, unfortunately. I got a nasty scratch on my phone's screen, and I haven't a clue how it happened, since it always stays in its case.
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