Yep pretty much, you can control individual lights by changing the number that is assigned to them by the bridge.

socket.write('PUT /api/Hue Login Here/lights/Light Number Here/state/action HTTP/1.1\r\nContent-Length: '+commands.length+'\r\n\r\n'+commands);

Or if it's useful you can group them and control all lights in a group as well.

socket.write('PUT /api/Hue Login Here/groups/Light Group Here/action HTTP/1.1\r\nContent-Length: '+commands.length+'\r\n\r\n'+commands);

Luke