The ebook reader part is kind of disturbing, I have a warm mode on mine that I always use, and the brightness set as low as it'll go (I find it too bright, but they seem to use a linear scale so there's not much range of adjustment).
I have a red LED striplight above my bed for reading paper books so I will try using that for the ebook reader and see if I notice a difference. My main issue is that interesting ebooks keep me awake longer than interesting paper books, I have a "no screens after 8pm" rule but wasn't counting the ebook reader as a screen.
I recommend you to re-read the e-reader part but paying special attention to the scales of the graphs. They are all different.
Kobo Aura peaks at 4000 counts in the blue spectrum, while the incandescent also emits about 4000 counts. The Kobo Clara only emits 2500 counts when full warm.
The key thing IMO is that the paper book was 0.9 lux but they cranked the ebook up to 30 lux. I missed that the first time. They also had the ebook set to "harsh blue", which my ebook reader can do but it also has a "warm" setting as well as the obvious ability to turn the brightness down from "glare of a thousand suns" to "candlelight"
I have a red LED striplight above my bed for reading paper books so I will try using that for the ebook reader and see if I notice a difference. My main issue is that interesting ebooks keep me awake longer than interesting paper books, I have a "no screens after 8pm" rule but wasn't counting the ebook reader as a screen.