New lighting design (configuration 2 “S” shape and lighting proposal N1/LED1). Illuminance distribution in C1 due to the mix between natural and artificial light on 31 January, by representation with combination of false colour maps and isolux lines. At the top: illuminance lx with overcast sky conditions and hour 9,00 (left); illuminance lx with overcast sky conditions and hour 16,00 (right). At the bottom: illuminance lx with clear sky conditions and hour 9,00 (left); illuminance lx with clear sky conditions at hour 16,00 (right).