One light is enough for a wide range of portraits. Working with a single source also teaches you how light behaves, because there is only one thing to move. This article covers the principles and a few setups to try.
If you want the bigger picture first, start with our guide to portrait lighting.
Why start with one light
A single light keeps the setup simple and the shadows consistent, since everything in the frame is lit by one source. Many professional looks are built on one key light, with a reflector or the room itself providing the fill. It is also cheaper and easier to carry.
What counts as a light
- A speedlight (hot-shoe flash), ideally used off-camera. Our photography lighting types explained compares the options.
- A studio strobe or monolight.
- A continuous LED panel.
- A window or the sun, treated as a fixed light you position the subject around.
The principles below apply to all of these. With flash, the exposure is controlled differently from continuous light, so take a few test shots.
The principles that matter
Distance controls softness and fall-off
Moving the light closer makes it larger relative to the subject, so the shadows become softer. It also makes the light fall off faster across the scene. This is the inverse square law in practice (covered more broadly in lighting basics for photography): light intensity drops quickly with distance, so a subject close to the light and a background further away will see the background go darker.
Height and angle shape the face
A light slightly above eye level and angled down is a common, natural-looking starting point. Raising it more and moving it to the side creates deeper shadows under the nose and chin. Lowering it below the face looks unnatural and is usually avoided outside of special effects.
Modifiers change the quality
- Softbox: a directional soft light with controlled spill.
- Umbrella: a broad, softer light that spills more.
- Beauty dish: a slightly crisper light, often used for contrast on the face.
- Grid: narrows the beam to limit spill onto the background.
- Bare bulb or reflector dish: harder light with defined shadows.
Setup 1: Loop lighting
Place the light a little to one side of the camera and slightly above the subject’s eye line, aimed at the face. Adjust until the nose shadow forms a small loop on the cheek. Add a white reflector on the opposite side if you want the shadows lighter.
Setup 2: Butterfly lighting
Place the light in front of the subject, above the camera and aimed downward. A reflector held below the chin can brighten the shadows beneath the face. This is common for beauty work.
Setup 3: Rembrandt lighting
Move the light higher and further to the side until a small triangle of light shows on the shadow-side cheek. Keep the power such that the shadow side keeps some detail. Without a fill, the look is moody.
Setup 4: Side light for a dramatic look
Put the light at roughly 90 degrees to the subject. The face will be split between light and shadow. Use a reflector close to the shadow side if you want to open the shadow just a little.
Adding a reflector
A reflector turns your one light into something close to two. A white card gives a gentle lift, silver is stronger and slightly more contrasty, and a black card (a flag) does the opposite and deepens shadows. Position it close to the subject on the shadow side, and adjust by moving it nearer or further. For more on lifting shadows, see how to eliminate shadows in portrait photography.
Controlling the background
With one light, the background brightness depends on how far the subject is from the backdrop and the light’s spill.
- Place the subject further from the backdrop to let it go darker.
- Put the subject closer to the backdrop, and angle the light so some spill reaches it, to make the background lighter.
- Use a grid to limit spill if you want a darker backdrop.
Using a window or the sun as your one light
The same positions work with natural light, as explained in natural light for portrait photography. The difference is that you move the subject rather than the light. Our article on portraits without flash covers this, and soft light portraits explains how to find the softest source available.
Camera settings with a single flash
- Set manual mode, and choose a shutter speed at or below your camera’s flash sync speed.
- Use aperture to control flash exposure on the subject, and shutter speed to control how bright the ambient background is.
- Start with the flash at a low to medium power, take a test shot and adjust.
Common problems and fixes
- Harsh shadows: move the light closer, or use a larger modifier.
- Flat look: move the light further off the camera axis.
- Dark eye sockets: lower the light slightly or add a reflector below.
- Distracting background shadow: move the subject further from the wall.
- Hot spots on skin: pull the light back a little or soften it with a diffuser.
A quick practice routine
Photograph the same person from the same camera position while moving the light in steps: front, 45 degrees, 90 degrees, then higher. Compare the results. This builds the visual memory that makes setting up a real shoot much faster.