On the one had, I love the idea of people binding together to make a statement. On the other, I'm not sure who the hell needs the lights on at 8:30 in the freaking morning. The sun does that. For free. All day even.
I suppose this symbol makes sense, as participants may realize they're using a precious resource in an unnecessary way. But it's also a trivial action. Here's hoping no one turns the lights back on automatically at 9:31a.m.