Yes, we’ve had the opportunity to test out the Silent Knight SD505-PHOTO extensively. In comparison to the SD505-APS, the SD505-PHOTO offers enhanced photoelectric detection capabilities, providing improved sensitivity to a wider range of fires, including smoldering fires. Additionally, the SD505-PHOTO incorporates advanced technology for better false alarm rejection, which is crucial for minimizing disruptions and ensuring reliable fire detection. Overall, the SD505-PHOTO is a significant upgrade from the SD505-APS, offering improved performance and reliability in fire detection systems.