Rock Lights vs Underglow: Visually the same thing, underglow is generally regarded as car accent lighting, with rock lights being off-road focused. Rock lights are built to take a beating, however, so if you're ever going to bump into it on a rock or other object, these are the components you'll want! XKChrome Controllers: Often regarded as one of the best Bluetooth RGB Apps, XKGlow's XKChrome certainly has a wide variety of modes and functions to suite any taste. In addition to being able to dial in almost any color, the app includes the option to match a color based off of your phone's camera, 15 preset themes, a theme builder mode, turn signal override function, speed-related colors, music synchronization, and a sensor wire override. Wild!