Films have long made use of the orange/yellow color cast of the high pressure sodium vapor lights, which produce an extremely limited spectrum of light. As NoFilmSchool points out, the yellow light was a key part of the movie Collateral, and we'd say Drive counts on there, too. Now, with new, more neutral LEDs in place, colors will look far more accurate when you're taking photos or video—but we'll be losing a key visual shorthand for when a scene's shot at night. Give it a few years, and yellow lit streelight scenes might seem as out of place as a rotary telephone. And the tungsten white balance setting on your camera will be getting a lot less use.