In the visible spectrum, the exoplanet only receives 2.1% of the light Earth does, so it would usually not get much brighter than twilight anywhere on Proxima Centauri b's surface.
In the visible spectrum, the exoplanet only receives 2.1% of the light Earth does-for comparison Jupiter receives 3,7%. So it would usually not get much brighter than twilight anywhere on Proxima Centauri b's surface.