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Update: miraculously the replacement Libra arrived in no time at all--today. Apparently the warehouse it was dispatched from was quite nearby.
I'm keeping this one for sure. But something interesting to report:
- the first two Libras were really close to each other in backlight brightness and color temperature at the same settings--the only difference was in the evenness of the backlight distribution for amber and white LEDs.
- the replacement Libra has very different backlight from one of the first two I kept! It is noticeably dimmer at each backlight % setting, the max brightness is significantly less brigh. Also, before adding any amber illumination the base white LEDs are more green-tinged than the other one's. So when compared directly the new one looks a bit more warm-green and the "old" looks more blue-purple. I was really surprised and triple checked that the comfort light slider was completely set to zero on both.
On the plus side the replacement reader screen illumination is even enough to overlook imperfections. Yes it's strictly-speaking not actually even, but good enough to not attract attention while reading.
This tells me there were different sets of white LEDs used for the Libra H2O devices.
Either the LED manufacturer changed the spec or Kobo used a different manufacturer or model for LEDs from one batch to the next. I can see how that might affect reviews: I've seen some people complain about a "green tint" while others say theirs doesn't have any such tint. Personally I find the slight yellow-green to be easier on the eyes in lower light conditions, while the brighter blue-more-purple one I have looks best under bright daylight conditions.
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