Art-Net (although completely worthless, just as ETCNet) is much more widespread than ETCNet looking outside the US, even over WiFi. But while you're building something like this, why not go for an open protocol that is really designed for controlling lights, such as BSR E1.31? Plain stupid in my eyes; I'll have to fix their firmware. On another note, using WiFi for lighting control is idiotic. WiFi is no way near stable enough to provide a decent transport for time critical protocols.