I think you should change the way the on/off button i the notification behaves because you dont get any visible response, only a clicking sound. If you have your phone in mute and isn´t in the same room as the bulb. You don´t know it anything have happened as the field displaying if the bulb is on or off also has long latency.
You have this implemented in the widget, could you mabye fix this in the notification as well?