Quote:
Originally Posted by ottischwenk
I will only give a very short answer now.
A surface lit by a lamp also reflects back.
Your argument is wrong.
In terms of light there is 0 difference - and that is physically / optically proven and not a subjective impression.
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I don't deny that. If I use too much light behind me directed at the e-reader, my eyes hurt too. But there really is no real difference also between the effects of the lighting systems of e-readers and lcd screens - they both hurt eyes about equally, just like the light behind me, if it is too strong. It is not like the light beams of lcd backlighting are directly shining at the eyes. They hit the liquid crystal cells and get defused. And most of the lcd screens are edge lit anyway - the technology even more similar to the frontlight technology of e-ink readers.
The main difference is the presence of ambient light.
It is very unhealthy to have only the internal light of the e-reader and no other light. Or if the ambient light is too week. Actually, even a desk lamp is not enough.
In some countries it is forbidden to have only the desk light on with the ceiling lights off in workplaces and offices. The contrast is too unhealthy. And if only the screen is lighted, then that is true a million times more. If it is not an emergency, the ambient light perhaps should be even stronger that the light illuminating the screen, not weaker. And then only the ambient light might be enough. Or ambient light plus a dedicated reading light behind you.