Using "the light" (which is by no means photon, nor does this mean being electromagnetic wave powered) to power a smart device. This kind of sound dangerous considering the ghost stories where generation old electronics is enough to, well, you know what I am saying. At this point I am giving an entity a physical brain if not more. On the other hand we get to understand them somewhat better and more importantly don't need to worry about battery life, which is totally worth having them possessed. I will need a few more years in Physics and engineering.