Seems Los Angeles is replacing their high pressure sodium streetlights with blue LEDs (pdf). Some filmmakers are wondering about the effect this is going to have on the look of films shot at night, and how films will, in the future, be dated by their night scenes.
I grew up in Brooklyn, New York. When I was a kid, I just naturally assumed that everything, including the sky, turned orange at night (I was a particularly stupid child). I began my career in this industry installing cameras in and around New York City, and got used to night time color shots looking like they were being filmed through Jell-O. More importantly, I got a real feeling for the limitations of cameras at night- IR only illuminates the center of the image, after all.
As more and more localities change over to LEDs, we may have to rethink what cameras can and cannot do at night.