On: LED lighting badly suppresses human melatonin prod...

[pier25]

The ebook reader part is a bit weird since the paper doesn't state which model they used.

Many readers these days have warm LED lights. IIRC the Kindle Oasis can even adapt the temperature of the light.

[perihelions → pier25]

Kobo readers have adjustable light temperature as well. I think their entire lineup, barring the one cheapest model, has that now.

https://help.kobo.com/hc/en-us/articles/360017481174-Adjust-...

[mft_ → pier25]

It does state that it's an iPad (!) - see the Materials and Methods section, specifically page 1235.

[pier25 → mft_]

Lol that's not an ebook reader