Blue light in sunlight and in leds is different intensity. I never look at sun directly or I'll be blind. And I know that kindle light is reflected by epaper.
But it is long story.
I know that it is sounds like I'm little nuts.
But I checked it many times.
Also when I just bought voyage I didn't know that front light cannot be turned off. I thought that if I turn slider to left side then there's no front light.
I read it without knowing that there's still some light left.
And after few days of reading like that I started to feel like I was reading tablet computer. I slept worse. Was more tired etc.
And I didn't know why. With my previous ebook(which was on android) I didn't feel like that.
After searching I found out that there is some front light left. And after I jb my voyage and turned off light all was good.