Here is an elegant solar-powered light for your window that captures sun rays to produce light indoors. The Sunne Light is made from a curved strip of aluminum. It has solar cells on one side to harvest energy during the day to charge its battery. It measures 85cm and can be installed easily.
The Sunne light has 3 light settings, so it can simulate sunrise and help you get in the right mood to read or relax. It is expected to have an iOS/Android app to show you energy and light level.