Coverage is about 15 to 20 ft, has not been tested on that specific surface.
LED is very bright.
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The further you are away the wider the coverage but if go to far the brightness on the wall will diminish. I have mine about 20ft away from house and happy with that.
No it starts back at the original setting after its been turned off & then back on.
Yes you can do this, the colors and patterns are really beautiful!