Quote:
Originally Posted by MGlitch
I'd have to think the automatic natural light would use less power than the automatic brightness. The natural light one runs based off the time of day, which the Kobo keeps track of anyway. The automatic brightness requires the sensor, which is a new bit of hardware for Kobos and thus a more 'unknown' aspect.
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I wasn't thinking about the sensor, I was thinking about the process of doing the adjustment. There must be something running and checking the time and sensor level. If that is done once an hour, then it won't use much power, but the adjustments will be coarse. If it is done every minute, it will use more power, but probably look better. If it's done on a continuous loop, then it would use a lot of more power but I doubt it would improve things much. They could also be checking whenever you interact with the screen. So, no changes while reading a page, but update the levels when turning the page.
Some of that can be tested. Set the device up somewhere and change the external light level and see what happens. Or turn the auto-sleep off and leave the device somewhere and see what happens over a couple of hours. But, maybe it won't be obvious as the external light conditions are changing in ways that might make the changes on the device hard to see.