Quote:
Originally Posted by kandwo
Interesting! Thank you for the photo. I hope you are correct in your estimation here, as I do want to use the warm backlight at a low setting when reading at night. It's a very interesting topic - I've read a lot of conflicting reports regarding different kinds of lights and/or the effect of the temperature of said lights.
For instance, some claim that programs that filter blue light (f.lux, redshift, etc.) help with eye strain and sleep issues, while others are adamant it makes no difference whatever. Same thing with frontlight vs backlight. But even assuming that the light is equal in effect at the same amount, your experiment here shows that at perceived levels of equal light the quantity of light emitted from a frontlight would be smaller.
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When you look at an illuminated EReader, you see as if it were lit from the outside like a paper book - which it is. Because the light is thrown through the light guide layer onto the EInk module and reflected by it (the light source is behind the side cover).
If you look at a tablet, you are looking directly into the light source.