Put a photograph of a city at night from 1985 next to one from today and something will feel different before you can name it. The buildings may be the same. The composition may be similar. What changed is the colour of the light itself, and it changed because of decisions made by municipal engineering departments rather than by anyone thinking about photographs.
The orange era
For roughly four decades, the dominant colour of street level urban night was orange. That came from high pressure sodium lamps, which spread widely from the 1970s because they were far more efficient than the mercury vapour lighting they replaced.
Sodium light has a severe limitation. It emits across a very narrow part of the spectrum, which means it is extremely efficient at producing visible brightness and extremely poor at rendering colour. Under it, a red car and a brown car look identical. The world becomes a monochrome scene in amber.
Photographically this was both a problem and a gift. It made accurate colour impossible, but it produced an immediately legible mood. Those warm orange street scenes, with the glow pooling under each lamp, are a specific technological period rather than a timeless look.
The transition, and the backlash
Through the 2010s cities moved to LED at remarkable speed, driven by energy and maintenance savings that were simply too large to ignore. LED fixtures last far longer and draw substantially less power.
Many early installations chose cool white sources in the 4000 to 5000 kelvin range, partly because cooler LEDs were cheaper and more efficient at the time. The result was a visible and widely disliked shift. Streets that had been warm and amber became blue white and clinical.
The objections were not only aesthetic. Concerns were raised about glare, about the effect of blue rich light at night on sleep, and about the impact on nocturnal wildlife. A number of cities revised their standards and moved toward warmer LEDs, commonly 2700 to 3000 kelvin, which sit much closer to the colour of the older incandescent and sodium lighting people had been used to.
A photograph of a street at night now carries a rough date stamp in its colour. Amber suggests sodium, blue white suggests an early LED rollout, warm white suggests a later or revised one.
What this does inside the camera
Mixed lighting is the practical difficulty. A single frame of a modern city can easily contain warm LED streetlights, cool LED office interiors, neon or LED signage in saturated primaries, and vehicle headlights that are cooler again.
White balance is a global adjustment. Set it for the streetlights and the office windows go blue. Set it for the windows and the street goes orange. There is no setting that makes everything neutral, because the scene genuinely is not neutral.
The sensible approach is to stop trying. Pick the light source that carries the subject, balance for that, and let the rest fall where it falls. The colour tension between sources is usually the most interesting thing in the frame.
Neon, and what actually replaced it
True neon signage is glass tubing filled with gas that glows when current passes through it. Neon itself produces the familiar red orange; other colours come from different gases and from coloured tube coatings.
Most of what people now call neon is not. It is LED strip or flexible LED rope shaped to imitate the look. The difference is visible on close inspection. Real neon has a continuous glowing line and a soft halo; LED imitations often show individual points along the run and a harder edge.
For a photographer this matters because genuine neon has a distinctive falloff that reads as warmth and depth, while LED signage tends to be flatter and more uniformly saturated. Cities with preserved historic signage districts still offer the real thing.
Why the sky is no longer black
There is one more change worth knowing about. The overall quantity of light escaping upward has increased in many regions, and the spectrum of that escaping light shifted with the LED transition.
In practice, urban night skies in photographs rarely render as true black. They pick up a glow from the city beneath, and the colour of that glow has moved from orange toward a more neutral grey or faintly blue cast. Older night photographs often show a warm sky; newer ones more often show a cooler one.
If you want a deep sky behind a lit skyline, the reliable answer is not to wait for full darkness at all. It is to shoot during blue hour, when the sky still carries its own colour and overwhelms the glow from below.
