| Abstract [eng] |
This study aimed to investigate the use of UV-C LED modules for creating a hybrid lightingdisinfection solution suitable for healthcare institutions. High-quality UV-C LED modules were constructed using specific 275 nm wavelength UV-C LED chips. The constructed UV-C radiation source was applied to the LED luminaire to create the hybrid solution. The photometric and photobiological properties of the LED luminaires and UV-C radiation sources were investigated. The luminaire "X" was found to have high efficiency, excellent 92.2 colour rendering index (CRI), and a suitable colour temperature (CCT) of almost 4000 K for work requiring concentration. A specific polymethylmethacrylate (PMMA) de-glaring micro-prismatic diffuser (DPRZ) with a matt light scattering layer was used for healthcare premises applications. The photobiological measurements of UV-C radiation sources were conducted to determine the optimal duration of premises disinfection required to avoid potential transmission of diseases outside of healthcare institutions. The results showed that 3 UV-C LEDs had the best sterilization abilities of all measured variations. For the SARS-Cov-2 virus or coronavirus, which requires a 50 J/m2 dose for even 99% sterilization, the required time would only be 42 minutes assuming a distance of 2m between the UV-C light source and the objects in the healthcare premises. Other investigated microorganisms required higher doses and time for 90% sterilization, which were not suitable for safe surface disinfection. The outcome of the research provides valuable information about the properties and applications of recently invented UV-C LED sources. The hybrid solution created in this study has the potential to provide efficient and effective disinfection in healthcare premises, thereby reducing the risk of transmission of diseases. |
