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There was: http://9to5mac.com/2015/11/12/flux-iphone-sideloading-shut-d...

Even if I set the iPad to its lowest brightness, though, it's still about 10x brighter than the lowest I can set the backlight in a Kindle Paperwhite.

IOS 9.3.4b also has automatic temp control built in. I was sideloading f.lux -- but this works just as well.