My friend recently attended an event at which Ray Kurzweil and an urban planner named Richard Florida were speaking. He didn't like Richard Florida as a speaker, citing how Richard Florida 'sounded just like a politician', and was speaking 'only in applause lights'. I noted it was funny to use 'applause light' in that context, as an auditorium where the speaker looks over a crowd while bathed in light, saying things specifically to garner applause, is just about the most literal interpretation of 'applause light' I could think of.