Re: I do, but
Having got one I never use it. Blinding bright light when you’re reading the dark
Now - I don't have a kindle with a light (I much prefer kobo - far more functional and not tied into the Amazon advert machine) but I'm pretty certain that the light levels are controllable.
Doubtless, someone will be along shortly to tell us otherwise..
 And easily cabable of reading Amazon ebooks once downloaded and converted.