Here's what I mean by "SiPix is heavy on eyes" for indoor reading:
This was a standard 60W bulb right over my head.
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With bedlight, my eyes tell me it's unreadable for more than 10-15 minutes:
At present I think the background is as dark as the Triton. Luckily, Triton has got far more intense black than this.
Same 60W bulb as lighting, on the PE's Vizplex: the result is clearly more readable than the SiPix. Note that in the reader I'm zooming (reflowing) the text column I'm touching from the tablet side.
Not the same bulb, but this shows the comparison between Pearl & Vizplex. Pearl has more intense black, and a a bit lighter background.

Note the shameful lacking of reflow in DXG