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There was also a hardware change with the Glo: the first Glos had a brighter, cooler light; later Glos had a dimmer, warmer light. Something to keep in mind if you are buying second hand, or watching one of those review videos where the reviewers compare the latest reader with an old Glo running out of date firmware.
(Eyes are different too. I have one of the earlier Glos with the brighter light, but in a completely dark room I read with the light set at about 10-12%.)
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