This application is part of light detection project called WC-Bulb. It displays current state as a toolbar icon. Works under Windows and Linux. Uses PyQt5.
NodeMCU part is here: https://github.com/bkosciow/nodemcu_light_detector
See more: https://koscis.wordpress.com/tag/wc-project/
Bulb icons taken from http://www.iconsdb.com