## 4 Experimental Results
### Experiment Setup  
The CERTH/ITI nZEB Smart Home is a state-of-the-art facility designed to resemble a typical residential building, providing occupants with an immersive experience of a real-life living situation [31]. It serves as a platform for testing and demonstrating cutting-edge technologies in the areas of energy, health, big data, robotics, and artificial intelligence (AI) within the context of a smart IoT-based framework (Figure 7). This groundbreaking initiative represents the first of its kind in Greece, as it integrates advanced construction materials and intelligent ICT solutions to create a sustainable and adaptable environment for testing, validating, and evaluating innovative solutions. The near-Zero Energy Smart Home of CERTH/ITI aims to offer a future-proof setting that promotes sustainability and fosters the development of pioneering technologies.  
Figure 6: Overall visual comfort system architecture.  
In addition to its role as a pioneering near-zero energy smart home, the CERTH/ITI facility serves as a fully operational ICT test bed, actively utilized in over 200 European projects since 2017. Its extensive usage in various initiatives demonstrates its significance as a leading research and development facility in this field. Furthermore, ongoing research efforts are dedicated to optimizing the installation of sensors within its infrastructure. This focus on sensor placement aims to enhance the collection and analysis of data, enabling the more precise and efficient monitoring of the smart home's performance and the technologies implemented within it. These efforts will contribute to advancing the understanding and application of intelligent ICT solutions in the context of sustainable living environments.  
CERTH/ITI has conducted extensive research focused on the installation locations of illuminance sensors, ensuring optimal placement within the smart home infrastructure. This meticulous investigation has involved identifying key areas where the accurate measurement of illuminance levels is crucial, such as near windows, in different rooms, and in specific functional areas. By determining precise locations for these sensors, CERTH/ITI has facilitated comprehensive data collection, enabling a detailed understanding of the lighting conditions throughout the smart home. This meticulous research and attention to detail make CERTH/ITI an ideal solution for testing novel methods for visual assessment estimation. The facility's comprehensive sensor deployment, coupled with its innovative technologies and infrastructure, provides an ideal environment for validating and refining new approaches to visual assessment.  
The selection criteria for CERTH's Smart Home focus on but are not limited to creating a comprehensive and realistic testing environment. While the primary purpose of the Smart Home may not be specifically centered around visual comfort, the integration of advanced technologies and meticulous research conducted by CERTH/ITI ensures the achievement of high visual comfort within the facility [15]. As a result, retrieving illuminance data from CERTH's Smart Home is an ideal solution to test a visual comfort methodology.