I have that functionality in FLEXi lighting. I basically identify one light as the “master” light, and then have the option of identifying additional lights as either being a “slave” light or a “free” light. Any “slave” light received the level (and in case of Hue lights, color) settings of the “master” light. To accomplish this, I needed to add some custom attributes / methods to the devices that I use within the system. Check out FLEXi Lighting - a flexible system for lighting scenes (Hues, dimmers, and switches) – specifically the code for the FLEXi Scenes and Flexi Triggers Apps, and the code for the FLEXiHue device type.
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