Ain Shams University

A simulation of the illuminance of an alleyway at noon at two different times of year, autumn (top) and winter (bottom). The new light-directing panel increases the amount of light that reaches the alleyway, as indicated by the higher amounts of red and yellow in the right-hand images (“with panel”) compared to the left-hand images (“without panel”). Credit: Optics Express.
Let the Sun Shine In: Redirecting Sunlight to Urban Alleyways