Here's a very simple script for changing the light radius of two objects. I'm using this to control the house lights for my arena. var lights = function(radius,dim) { var light1 = findObjs({_type: "graphic", name: "light1"})[0]; var light2 = findObjs({_type: "graphic", name: "light2"})[0]; light1.set("light_radius", radius); light2.set("light_radius", radius); light1.set("light_dimradius", dim); light2.set("light_dimradius", dim); }; on("chat:message", function(msg) { if(msg.type == "api" && msg.content.indexOf("!lite") !== -1) { lights(100,100);};}); on("chat:message", function(msg) { if(msg.type == "api" && msg.content.indexOf("!dark") !== -1) { lights(100,0);};});