Shadow-Caster Single Zone RGB(W) Controller [SCM-SZ-RGB]Single Zone RGB(W) Controller The Shadow Caster Single Zone Lighting Control is a low cost, marine grade RGBW LED controller that can be operated from a standard push button switch to set color and brightness. The Single Zone Controller also has a built in Shadow NET interface that allows the controller to synchronize color and brightness control with other Shadow NET devices, for example, to make Shadow Caster underwater lights match the color of