In this paper a novel and robust lighting controller with green soul has been presented. The GreenSoul-ed device is a fully autonomous and automated controller, which can control the lights in a building space without compromising users' comfort preferences. It can automatically dim the lights achieving users' preferences in real-time through a proportionalintegral-derivative (PID) controlling mechanism. To this end, it is equipped with a luminance sensor, as well as with embedded intelligence, while the processing and the decision making is performed on the controller (FoG computing). Furthermore, it supports a variety of functionalities, such as profiles, schedules, timezones, etc., while it is fully parameterized through its web interface. The preliminary experimental results has shown that the proposed GreenSoul-ed lighting controller can achieve more than 75% electricity savings of lighting in a building.

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