http://www.PaulColligan.com How do you set lower bandwidth for a Google Hangout On Air. It's very easy, as can been seen in this video below.
One of the most powerful features of Google Hangouts On Air is that you can adjust the bandwidth from each attendee based on what bandwidth is available. If you are connected to a Google Hangout and don't have the ability to stream in full HD, don't worry, you can adjust as is seen in this video. http://www.youtube.com/watch?v=IyPpcxM7ISw