Thank you to those of you who commented on my previous post to let me know that your basic Kindle or Nook e-readers are not backlit and therefore, not a source of blue light.
My apologies for making an incorrect assumption and lumping all e-readers in with tablets, computers, i-Phones and similar devices. If an e-reader is backlit, it is probably a source of blue light. If it is not, it probably isn’t.
My source mentioned that Barnes & Noble and Amazon both declined requests for interviews regarding the blue light issue. Since the Kindle Fire is backlit, it may be a source of blue light.
The ad for the Nook Simple Touch with Glowlight says its “breakthrough technology creates a soft glow optimized for low light reading… warm light illuminates entire screen evenly.” “Warm light” would suggest non-blue light, but some reviewers refer to the “blue Glowlight.”
I couldn’t find any product specifications that indicate whether the Glowlight technology emits blue light or not. Harvard Health Publications lists LED lights as a source of increased blue light and the Simple Touch does use LED lights.
Those of you with e-readers, please add your observations to the conversation. Which device do you use, do you know if it is a source of blue light and have you noticed any change in your sleep patterns when you use your e-reader?
Bane of Your Resistance 
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