I discovered this a while back and used to have it in my sig. Though I think what you're doing is different. Ah well~
The BBCode: The result: I discovered this just a few days ago. Too bad I've only seen it work in Chrome.
That's pretty much it, just that the individual letters and words don't light up or go dark at the same time.
What a lovely way to put it. Will never stop thinking that whenever I see this now. Reminds me of a story I once wrote titled Night Drive that included a scene about nighttime Los Angeles city lights returning to buildings after a power outage. The story likes to romanticize how the city glows. To quote from that story: Then after the power outage: The story was mostly inspired by the film Drive's opening scenes where the city is at night.