The solar energy spectrum has 45 per cent energy as visible light, and this can be used to harvest building illumination for about 9-11 hours a day.
The Technology Development Board (TDB) under the Ministry of Science and Technology will provide Rs 5 crore as support to a startup called Skyshade Daylight Private Limited for developing new technologies for 24×7 basement illumination. The company works on lighting technologies to reduce carbon footprint and improve energy efficiency.