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I can envision the side-led lighting system with a thin plexiglass screen to spread the light (as in the LightWedge) but I can also see an incredible drop in battery life, and potentially the need for a larger battery to provide the power necessary to power the LEDs. It may well be that the power necessary for the e-ink technology and the processor in the 500/505 is very small and not capable of powering any sort of lighting device (the fancy blue light on the 500 which lit when setting or removing the bookmark notwithstanding).
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