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If the light actually lights the whole screen evenly, I might be interested in something like that. I don't ever "read in the dark", and I don't use booklights (haven't seen any that look to light the whole screen evenly) but there are plenty of cases where I'd rather have a little bit of focused extra light in addition to sunlight in a shady room or a bit of extra light in a room lit by ceiling lamp when it's not quite dark yet outside. And in that case it's always tricky to decide whether to make do with slightly less light than I'd like or to turn on a strong floor lamp that is still overkill under those conditions.
I could also see it being useful in places where the ambient lighting isn't up to the user to adjust - sitting in a dimly / unevenly lit corridor waiting for a doctor's appointment, on a bus, on a plane... various environments where there is just barely enough light to get by but not necessarily comfortably.
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