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Single or multiple convex mirrors ?

Externet
in Engineering

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The purpose being to iluminate a north side wall of a house to decrease mold growth.

 

- One single large convex mirror, or an array of many small convex mirrors (equal in mirror area) -

Which choice will reflect more sunlight to the dark wall for a decent number of sunlight hours and angles daily ?

 

Or is there a preferred shape as ellipsoidal for the task ?

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