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My own conclusions
Well, the article and study did have a good effect on me that I am very thankful for. It appears that too much blue light at bedtime or before is bad for sleep. I have checked my settings on my prefered ereader in bed - a PW1. Used to read at about light level 10 in bed. Turned it down to 0 (the lowest setting) and it works quite well there. It was still bright after a while and on the blueish side. Switched to phone (Note4 oled) with Kindle app - and that even turned down in night mode (white text on black) could have been darker. Further research from me revealed a very nasty effect of oled - and that is screen burn-in. It is beautiful, yes, especially since black is really black, but it is inferior to lcd with the comeback of burn-in.
Next candidate my tablets (both with lcd, yay) - switched reading app to fbreader (calibre integration, automatic sync, customizeable colors). Changed settings around for night-mode with black background and dark red (no blue, no green, just pure red) text. Screen dimmed down a lot - and it is beautiful to read in bed. Feels even nicer to my eyes than the PW dimmed down as much as it goes. Added benefit of the red is the night vision not being destroyed and it is as far away from blue as possible. Even on my phone now for on the go I am leaving the night mode of fbreader on with red text.
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