Operating with standard 230V (LV) and 48V (ELV) and also Plus+ lamp supplies, the Helios family includes standard tungsten halogen optics and the latest generation of Central Light Source (CLS) LED optics, providing the benefit of low-power consumption and extended operational life. Employing a highly developed SIRA style flat lens, the optic design ensures that maximum transmission of illumination whilst ensuring that extraneous light is not reflected back to the viewer when the signals are switched off. The result is a signal that is extremely clear and easy to see in all weather and lighting conditions.