In short: Three-point lighting uses a key light to define the face, a fill light on the opposite side to soften the shadows, and a back light behind the subject to separate them from the background. The fill is usually softer than the key, at up to half its intensity. Add a background light for four-point lighting when the background needs its own shape. Place the key first, check the shadows on camera, then adjust.
What each light does
The key light is the main light. It sets the direction and the mood of the shot, and everything else is built around it. The fill light sits on the other side of the camera, usually lower and roughly at face level. It lifts the shadows the key leaves, so the face keeps its shape without going flat. The back light sits behind the subject. It draws a line of light along the hair and shoulders, which separates the subject from a dark background.
Placing the lights
- Put the key at roughly 45 degrees to the side of the camera and above the eye line. Look at the shadow of the nose. It should fall gently to one side, not straight down or straight across.
- Set the fill on the opposite side, lower and softer. Start it at about half the key's strength, then check the shadows on the monitor.
- Place the back light behind the subject, above head height and to one side. Look at the lens before you commit, because a back light that is visible in the lens causes flare and a grey picture.
- Light the background separately if it needs its own shape. This makes a four-point setup, with a background light placed behind the subject.
- Check the shot on the monitor with the person in the chair, as well as taking a meter reading. Then adjust a little at a time.
Variations
- Reflector fill. A white card or board can replace the fill lamp. It gives a softer, lower-contrast fill and is quieter on set.
- Low-key. Use little or no fill, for tension or drama. Low-key is a choice, so it should be a deliberate one.
- Kicker. A light that only catches the edge of the subject, without adding to the lit side of the face. It differs from a back light in that it does not light the surface of the subject.
- Practicals. A lamp or a window in the scene is a real light source. Use it as a key or a back light only when the shot can carry it.
Common mistakes
- Putting the key on the camera axis. The face looks flat and the shadows disappear behind the head.
- Making the fill as bright as the key. The face loses its shape and the shot looks pasted together.
- Letting the back light show in the lens or flare the picture. Flag it off the lens.
- Lighting the subject but not the background. The subject then sits in a grey void with no sense of space.
- Adding lights without moving the old ones. Each new light changes the shadows of the others.
Where it fits
For a cove, the background is lit on its own, so the subject can stand in front of an even sweep. Lighting an infinity cove covers the cove side. For the lighting plan on a studio shoot, lighting a show that's being filmed explains what to tell the lighting designer, and the lighting plot planner puts the fixtures on paper. For colour, see colour temperature and gel cheat sheet.
Sources
- Wikipedia, Three-point lighting, read 5 November 2026
Related guides
Questions we get asked
How bright should the fill light be compared with the key?
Usually up to half the key's intensity. A fill at full strength flattens the face, and no fill at all gives harsh shadows that suit only a deliberately dark look.
Where should the back light go?
Behind the subject, above head height and to one side, so it outlines the hair and shoulders without showing in the lens.
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