That's very helpful -- thank you. I've heard of them and considered it, especially as academic pdfs are indeed what I read. The trouble is that colour is really

That's very helpful -- thank you. I've heard of them and considered it, especially as academic pdfs are indeed what I read. The trouble is that colour is really quite important in my field, and I'd like a backlight to use while I'm in bed and my partner is asleep! Thank you very much for replying!