Light painting is one of the most fun things you can do with a camera. You stand in the dark, wave a light source around, and the camera records every movement as a glowing line floating in the air. Shapes, spirals, words, halos around a person, all drawn with nothing but a flashlight.

It used to be a DSLR-and-tripod hobby. Now your iPhone can do it, and this guide covers everything: what light painting is, what you need, the settings that work, and the mistakes that ruin most first attempts.

What Is Light Painting?

Light painting is long exposure photography flipped around. In a typical long exposure, the world moves and the camera records the blur. In light painting, the scene is dark and still, and you move a light source through the frame while the exposure runs. The camera keeps collecting light the whole time, so everywhere your light travels leaves a bright trail in the final image.

The longer the exposure, the more you can draw. A few seconds is enough for a quick squiggle. Thirty seconds gives you time to write a word or trace an outline around a friend.

What You Need

  • A dark environment. This is the big one. Light painting needs darkness so your moving light stands out against the background. A dark room, a backyard at night, or any spot away from streetlights works. The darker the scene, the cleaner the trails.
  • A moving light source. A phone flashlight, a small torch, a sparkler, fairy lights, a bike light. Anything bright you can wave around. Different sources draw different lines: a bare flashlight gives a hard, thin trail, while a sparkler throws off a wide spray of light.
  • A way to keep the iPhone still. A small tripod is ideal, but a shelf, a stack of books, or a phone leaned against a wall all work. The camera must stay put while you move.
  • A long exposure camera app. The default iPhone camera picks a fast shutter speed automatically and gives you no way to slow it down, so it can't record light trails on its own. The Live Photo long exposure effect blends only about 3 seconds of footage, which is too short to draw much. A dedicated app like Lento lets the exposure run as long as you want.

iPhone Light Painting Settings

Light painting rewards a specific setup. Here's what works in Lento, and the logic transfers to any long exposure app:

  • Mode: Light Trail. This mode uses lighten blending, meaning it keeps the brightest pixel from every frame. Your dark background stays dark while every pass of your light gets recorded at full strength. It's the same mode used for car light trail photography, and it's exactly what light painting needs. Smooth mode would average your light into the darkness and wash it out.
  • Duration: start with 10 to 30 seconds. Ten seconds covers a simple shape. Thirty gives you room for words or detailed patterns. For full freedom, Bulb mode keeps the exposure running until you tap stop, so you finish drawing on your own schedule.
  • ISO: keep it low. Your scene is dark and your light source is bright, so you don't need high sensitivity. Lower ISO (Lento goes down to 100) keeps the background clean and noise-free.
  • Focus: set it manually. Autofocus hunts in the dark. Light up the spot where you'll be drawing, lock focus there manually, then kill the light and start.
  • Timer: use the 3 or 10 second delay. This avoids shaking the phone with your tap, and gives you time to get into position with your light.

One advantage of frame stacking apps: you see the painting build up live on screen. Lento captures at 30fps and blends frames in real time, so you watch each stroke appear as you make it. With a traditional camera you'd draw blind and check the result afterward. Here you know immediately if you missed a spot.

Step by Step: Your First Light Painting

  1. Set up in the dark. Frame the empty space where you'll draw. Stabilize the phone.
  2. Lock focus. Shine your light where you'll stand, focus on it, switch to manual so it stays locked.
  3. Choose Light Trail mode and set your duration. 15 seconds is a comfortable first attempt.
  4. Start the timer and get in position. Light off until the exposure begins.
  5. Draw. Move steadily and deliberately. Point the light toward the camera for bold trails. Remember that letters come out mirrored, so write backwards or flip the image after.
  6. Step out and review. Wear dark clothes and keep moving; if you don't linger in one spot, you won't show up in the photo, only your light will.

Once you have the basics, light painting combines well with other night techniques. Try painting light onto a foreground subject during a cityscape shot, or mix trails with the skills from our iPhone night photography guide.

Common Mistakes

Too much ambient light. If streetlights or indoor lamps are visible, the long exposure accumulates them and your trails get buried. Find real darkness.

Moving too slowly with the light. Lingering makes hot, blown-out blobs. Keep the light moving at a steady pace.

Standing still in frame. If you stay in one place for a chunk of the exposure, you become a ghost in the shot. Keep walking.

Bumping the phone. Any camera movement during the exposure smears the whole scene, not just your light. Set it down, use the timer, don't touch it.

If you're new to the technique behind all this, our beginner guide to long exposure on iPhone explains how frame stacking works and why it beats the built-in Live Photo trick.

Frequently Asked Questions

Can I do light painting with the built-in iPhone camera?

Only in a limited way. The Live Photo long exposure effect blends about 3 seconds of footage, which is barely enough for a quick scribble, and you can't preview or control it. For real light painting you need an app with adjustable exposure time.

What's the best light source for light painting?

Start with whatever you have: a second phone's flashlight works fine. Sparklers give dramatic, textured trails. Small colored lights or fairy lights add variety. Brighter and more directional sources make sharper lines.

How long should the exposure be for light painting?

10 to 30 seconds covers most drawings. Simple shapes need less, words and detailed patterns need more. An unlimited or Bulb mode removes the time pressure entirely, since you stop the exposure when the drawing is done.