Which of the following is NOT a benefit of using photoelectric cells?

The choice indicating "Limited operational range" is correct as it is not a benefit of using photoelectric cells. Photoelectric cells, commonly known as photo sensors or light sensors, are designed to detect light levels and control lighting systems based on ambient light conditions. One of their main advantages is their ability to operate automatically, adjusting based on the amount of natural light available, which provides convenience and efficiency.

The operational range of photoelectric cells is often quite extensive, allowing them to function effectively across various lighting environments, rather than being limited in scope. Therefore, "Limited operational range" wouldn't be considered a benefit, as most photoelectric systems are designed to cover a broad range of conditions.

In contrast, the other options highlight some of the substantial benefits these sensors provide. Automatic operation allows for hands-free control of lighting, while energy savings are achieved through the sensors turning lights off during the day or in well-lit conditions. Enhancing control systems refers to the capability of photoelectric cells to be integrated with various lighting controls, which can further optimize energy use and improve system responsiveness.