Light trail photography turns ordinary traffic into streaks of red and white flowing through the frame. It's one of the most visually striking things you can do with a camera at night, and you can absolutely do it on your iPhone.

This guide covers how to capture light trails, where to shoot, what settings to use, and some creative ideas beyond car lights.

What Are Light Trails?

Light trails happen when you photograph moving light sources with a long exposure. Car headlights and taillights are the most common subjects. As the car moves through your frame during a multi-second exposure, its lights paint continuous streaks across the image.

The car itself becomes invisible (or nearly so) because it's moving too fast to register in any single position. But the bright lights leave a trace wherever they travel. The result: glowing ribbons of light against a sharp cityscape.

Best Locations for Light Trail Photography

Not every road makes for good light trails. You want locations where traffic flows predictably and the surroundings add to the composition:

  • Bridges and overpasses. Shooting from above gives you a clear view of the road with light trails stretching into the distance. Pedestrian bridges work perfectly.
  • Highway curves. Curved roads create flowing, organic light trails instead of straight lines. An S-curve is the holy grail.
  • Busy intersections. Cars turning, stopping, and going in multiple directions create complex, layered light trail patterns.
  • High viewpoints. Hillsides or parking garages overlooking a freeway give you sweeping compositions with trails stretching across the frame.
  • City streets with landmarks. Include recognizable buildings, signs, or architecture to give context and scale to the light trails.

How to Capture Light Trails on iPhone with Lento

Lento has a Light Trail mode that's built specifically for this. It uses lighten blending, which keeps the brightest pixel from each frame. This means light sources accumulate over time while the dark background stays dark. Exactly what you need for light trail photography.

  1. Open Lento and select Light Trail mode. This uses lighten blending, so bright lights will build up over time while the dark sky and road stay clean.
  2. Set up your iPhone on a tripod or stable surface. Night photography requires absolute stability. Any movement during a 15-30 second exposure will ruin the shot.
  3. Frame your composition. Include the road, some surrounding buildings or landscape, and leave room for the light trails to flow through the frame.
  4. Set exposure time to 15-30 seconds. Longer exposures mean more cars pass through your frame, creating more trail density. Start with 15 seconds and increase if you want more trails.
  5. Use the timer. Set a 3-second timer so you're not touching the phone when the exposure starts. Even the tap of the shutter button can cause shake.
  6. Tap shutter and wait. Watch the light trails build up in the real-time preview. If the traffic is light, go for a longer exposure to capture more cars.

Settings for Car Light Trail Photography

Exposure time: 15-30 seconds. This is the sweet spot for most traffic situations. Shorter than 15 seconds and you might not get enough cars in the frame. Longer than 30 seconds works too, especially for slower roads.

ISO: Keep it low. Lento handles this automatically, but lower ISO means less noise in the dark areas of your image. Night shots with high ISO look grainy and muddy.

Focus: Lock it. Tap on a building or streetlight to set focus, then lock it. You don't want autofocus hunting during a long exposure.

Shoot During Blue Hour for the Best Results

Most people think light trail photography is a pitch-dark activity. It's not. The best light trails come during blue hour, the 20-30 minutes after sunset when the sky is deep blue but not yet black.

Why? A completely black sky looks flat and boring. A deep blue sky adds color, depth, and detail to the background. You can also still see buildings and clouds, which gives the image more context than just trails floating in darkness.

The timing is tight. Get to your location before sunset, set up your shot, and start shooting as soon as headlights become visible. You have about 30 minutes of prime conditions.

Creative Light Trail Ideas

Car light trails are just the beginning. Once you're comfortable with the technique, try these:

  • Light painting. Have a friend walk through the frame waving a flashlight, phone screen, or sparkler. The Light Trail mode will capture their movement as a glowing streak.
  • Ferris wheels and amusement rides. The spinning lights create circular patterns that look incredible in long exposure.
  • Boats and ferries. Waterfront light trails with reflections on the water. Especially good during blue hour.
  • Trains and trams. Rail lights create perfectly straight, parallel trails that look very clean and graphic.
  • Airplane trails. Near an airport, planes taking off or landing create long diagonal trails across the sky. You'll need 60+ seconds for these.

Composition Tips for Light Trails

Use leading lines. Position yourself so the road leads from the foreground to a vanishing point in the distance. The light trails will naturally follow the road and pull the viewer's eye through the frame.

Include something static. A building, a tree, a sign. Static elements ground the image and give the light trails something to contrast against.

Shoot wide. Use the 0.5x ultra-wide lens on your iPhone to capture more of the scene. Light trails look more dramatic when they span the full frame.

Light trail photography is one of the most fun things you can do with your phone at night. Grab a tripod, find a busy road, and try it with Lento.