One Lamp, One Reflector: Night Interior

What does one lamp and a reflector actually give you?

One lamp placed close to the subject and one white reflector opposite it will light a small room at night well enough to shoot, provided you accept a contrast ratio of about 4:1 and keep the window out of the frame or expose for it deliberately. The lamp does the work; the reflector decides how much of the shadow side survives. Nothing here replaces a second light, it just delays the need for one.

Work at 3200 K if the lamp is tungsten, or gel a daylight LED down to tungsten so the window and the lamp do not fight. Set the camera to the lamp, not to the room. The room will go dark around the subject, and that is the look.

If you want a second opinion on what a viewer actually takes from a short night scene, the viewing guides at Niagara Indie Film Fest are built around holding one small question in mind for a ten to twenty minute film, which is roughly the attention span you are lighting for.

Where does the lamp go?

Place the lamp at roughly 45 degrees off the camera axis and slightly above eye height, about 30 to 45 cm above the subject's eyeline for a seated person. Distance matters more than angle. At 1 m from the face with a bare 60 W equivalent bulb you get a usable key at f/2 and 1/50 s at ISO 800. At 2 m you lose two stops and the falloff across the room flattens out, which is the opposite of what you want.

Keep the lamp just outside the frame edge. If the lamp is in shot, flag it or move the camera, do not dim it. Dimming a tungsten lamp shifts it warmer and drops the key below the level the reflector needs to return anything useful.

For a small room, a lamp with a shade is better than a bare bulb. The shade cuts the spill that would otherwise bounce off the ceiling and fill the whole space, which kills the shape you are trying to build.

How do you use a reflector without flattening the face?

Put the reflector on the opposite side of the face from the lamp, at the same height as the lamp or a little lower, and start at 1 m from the subject. A 5-in-1 at the white side returns roughly one stop less than the key at that distance. That gives you a shadow side that reads as shadow but still shows skin texture.

Angle the reflector so it catches the lamp, not the room. If you can see the lamp's reflection in the reflector from the camera position, it is pointed wrong. Tilt it until the hot spot sits on the cheek, then stop.

Silver returns about two stops more than white and will read as a second source. For a night interior that usually looks wrong, because the shadow side ends up as bright as the key and the room stops feeling like night. Use white, or bounce into a sheet of foam core if you want something softer still.

What is negative fill and when do you need it?

Negative fill is a black surface placed on the shadow side to take light away. In a small room at night you need it more often than you need a reflector, because walls, ceilings and pale furniture all bounce light back and fill the shadows for you whether you asked or not.

Hang or prop a black cloth, a black jacket, or a sheet of duvetyne about 50 to 80 cm from the subject on the shadow side. Watch the shadow side of the face and the wall behind it. When the wall stops glowing, you have gone far enough. Two stops of difference between the lit and unlit side of the face is a good working target for night.

Do not black out the whole room. Leave one practical in the background, a table lamp or a hallway light, so the frame has somewhere for the eye to go.

How do you expose so the window stays readable?

Expose for the lamp and let the window sit where it sits, unless the window is part of the story. At night, a window with a streetlight or a lit building outside is usually two to four stops brighter than your key. If you expose for the face, the window blows out to white and reads as a hole in the frame.

Three options, in order of cost:

1. Expose for the face and accept the blowout. Works if the window is small and at the edge of frame.
2. Expose for the face and put a diffusion sheet or a light grid on the window to bring it down two stops. Cheap, and it keeps the shape of the window.
3. Expose for the window and lift the face with the lamp. This is the only option that keeps both readable, and it usually means the lamp has to be closer, which means the falloff across the room gets steeper.

Check the window on a monitor, not on the camera screen. Camera screens crush highlights and you will not see the clipping until the edit.

What are the practical limits of this setup?

One lamp and one reflector will light one person in one small room. That is the honest limit.

• Two people in the frame: the falloff across the gap between them will be at least a stop, and the reflector cannot cover both. Add a second lamp or move them closer together.
• A wide shot of the whole room: the lamp cannot fill it. You will see the dark corners, and they will look like dark corners rather than night.
• Movement across the room: the subject walks out of the key in two steps. Block the scene so the subject stays within about 1.5 m of the lamp.
• Mixed colour: a tungsten lamp and a daylight window in the same frame need a gel on one of them, or you accept the split and make it a choice.

If the scene needs any of these, you are past one lamp. That is not a failure of the setup, it is the setup telling you what it is for.

What goes wrong when you skip a step?

Skipping the flag on the lamp gives you a bright patch on the wall behind the subject that pulls the eye off the face. Skipping the negative fill gives you a flat, even light that reads as daytime with the curtains closed. Skipping the monitor check gives you a blown window you cannot recover.

Skipping the gel gives you a face that is orange on one side and blue on the other, which is a look, but only if you meant it.

Set the lamp first. Set the reflector second. Take away light third. Expose last. That order costs about twenty minutes in a room you already know, and about an hour in a room you do not.