The lounge light mode of your TV allows you to switch on the Ambilight when the TV is in standby. So you can light up your room with dynamic light flows by using the Ambilight.
After you have switched your TV to standby and wish to switch on the Ambilight lounge light, follow these steps:
NOTE: When [Quick start] is switched on in the TV menu, Ambilight lounge light will not work. You can enable / disable this option in the TV menu: [Setup] > [TV Settings] > [General Settings] > [Quick start] > [Activation].