That's a flash of lightening from "Dying for Fame," actually. You're right that it looks a great deal like sunlight; I hadn't thought about that before. It is so fleeting until you capture it in a still. I've always known that the storm harmonizes with his mood in that scene, but I hadn't considered that those brief flashes of lightening light ara a kind of tease of daylight, and perhaps that's why Nick chose to sit on his windowsill that time, when he normally angsts on his rug.

I believe that's the only lightening storm in the series.

Good for that director and crew! "Dying for Fame" is my favorite episode. Finding something new to appreciate in it is outstanding. Thank you.