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Sony experimented with side-lighting their PRS-700 Reader. Reviews were mixed, but Sony must have received more user complaints than praise, because the model was quickly discontinued, and none of their current models feature a lit screen.
One problem with side-lighting is that there's no good way to light the screen and preserve the quality of the e-Ink display. Bare LEDs cause too much glare, and adding glass (or plastic, or polycarbonate, etc.) atop the screen to diffuse the light has a negative effect on screen clarity. Also, heat buildup and battery drain can occur with extended use.
I'd like the convenience of a built-in light, but not at the expense of making my eyes work harder to read the screen. That's why I ordered Amazon's new lighted case. I'm skeptical that it can provide good light coverage without excessive battery drain, and I'm concerned about adding weight and bulk to the device. But, Amazon has a generous return policy, so I'm willing to give it a try.
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