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This question already has an answer here:

Is there tool or application that can set the brightness of the screen below the system minimum?

marked as duplicate by geffchang, ale, Zuul, onik Mar 19 '14 at 23:12

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My personal favorite for this task is ScreenFilter, which is completely free (no ads, even) and has Tasker integration.

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Yes there are a dozen of them, go to the below link and download the app.

Vote up and choose answer if I helped :D

NightMode

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