The Sterilight ultraviolet disinfection system features an interlock switch molded into a Safety-Loc lamp connector. The interlock switch prevents lamp operation in the event that the lamp is not fully inserted into the reactor chamber. This new design offers the user quick removal of the lamp connector by hand without any special tools or assistance. Also included with the system is a Flow-Pace UV sensor, a discrete 254nm sensor that incorporates the latest in UV disinfection components for stable, long-life reliability. In addition, the sensor is capable of detecting a low-flow condition.