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If you are doing a hybrid/held-with lecture using the camera mounted at the back of the room, you should turn on the podium spotlights using the top On/Off switch button of the control panel switch next to the door (see below). Doing so will ensure that the front of the room has enough light for the camera at the back of the room to produce a decent image.
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The other light switches are still operational to provide additional options but these would be for special events, such as movies.