A control device and related user interfaces (UIs) and techniques for controlling the light output of a solid-state lighting device are disclosed. In accordance with some embodiments, the control device may be configured to present a UI having one or more adjustment features operatively associated with one or more adjustment modes by which the control device may control the light output of a downstream lighting device communicatively coupled with the control device. Via a given adjustment feature, a user (or other controller) may adjust one or more characteristics, such as intensity, correlated color temperature (CCT), and color of the emissions of the lighting device. In some embodiments, the control device may be a computing device, mobile or otherwise, and the UI may be presented by a display element as a graphical UI (GUI).