Which system component utilizes a knob labeled INST for control?

The component that utilizes a knob labeled INST for control pertains to the instrument panel lights. This knob allows the pilot to adjust the brightness of the instrument lighting in the cockpit, which is crucial for visibility during nighttime or low-light conditions. Properly illuminating the instruments ensures that the pilot can effectively read gauges and displays without causing strain or distraction, thereby enhancing situational awareness.

While other systems, such as avionics displays or navigation systems, might have their own brightness settings and controls, they are typically not labeled with "INST." Cabin lights do not directly relate to instrument illumination, as they are intended for general lighting in the cockpit area rather than specifically for the flight instruments. Therefore, the correct answer focuses on the systems involved in providing visibility to critical flight information.