Where to put your light when you only have one
One lamp, placed well, beats three placed badly.
Most people buy the light before they decide where it goes. That is the wrong way round, and it is an expensive habit, because the position is free and the lamp is not. A single light in the right place will make you look like someone who films for a living. The same light, sitting on your desk pointing straight at your face, will make you look like you are being interviewed about a crime.
The difference between those two results is roughly a metre of floor and about forty-five degrees of arc. Here is how to find it.
What is the light actually for?
A light does one job, and it is not brightness. Your camera can already see you. What it cannot do is tell the viewer what shape your face is, or where you are standing in relation to the room behind you.
Shape comes from shadow. A face lit from directly in front has no shadow anywhere, so it reads as flat, and flat reads as cheap, because it is what a webcam does. A face lit from one side has a bright side and a shaded side, and the line where one becomes the other is what makes a nose look like a nose. That line is the whole point of the exercise.
So the question is never how bright. It is where the shadow falls.
Where does the light go?
Three numbers, and none of them is a rule so much as a starting point you will move once you see yourself.
The angle: about forty-five degrees off centre
Stand where you will sit. Put the camera in front of you. Now move the light out to one side until it is roughly halfway between the camera and your shoulder. You are looking for a shadow from your nose that falls diagonally down towards the corner of your mouth on the other side, and stops before it gets there.
If the shadow reaches across your cheek and off the far side of your face, you have gone too far round. If there is no shadow at all, you have not gone far enough.
Which side? Whichever one your room allows. If you have a window, put the lamp on the same side as the window rather than fighting it. Two light sources arguing from opposite sides is the single most common way a home setup starts to look strange, and nobody can ever say why.
The height: above your eyeline, tilted down
Light from below is the torch under the chin, and your face knows it even if your conscious mind does not. Raise the lamp until it is higher than your eyes and angle it down towards you.
Not much higher. If the light is directly overhead you will get shadows in your eye sockets and under your nose, which reads as tired rather than dramatic. Somewhere around the top of your head, looking down at you, is enough.
The distance: closer than you think, then diffused
A small light close to you is a soft light. A small light far away is a hard one, and hard light on a face shows every texture you own. Bring the lamp nearer than feels natural, and if it has a diffuser, a softbox or even a sheet of baking paper clipped in front at a safe distance, use it. The bigger the source looks from where you are sitting, the kinder it is.
This is the one place a small purchase genuinely helps, and it is a diffuser rather than a brighter lamp.
What if the light has to be behind the camera?
Sometimes the room decides. A narrow office, a kitchen counter, a corner you cannot move out of.
In that case, accept the flatness and buy back the shape somewhere else. Move yourself further from the wall behind you: as long as your light stays close to you rather than moving back with the wall, the wall now sits much further from it and falls darker on its own, so you separate from the background by contrast instead of by shadow. Turn on a lamp in the background, well out of your eyeline, so there is something with depth behind your head. Both of these cost nothing and both of them do part of the job the missing angle was doing.
Do you need a second light?
Eventually, and not yet.
The second light is not there to make you brighter overall. It lifts the shadow side, adding a little light where the first one left dark, so the dark half of your face keeps some detail instead of going black. That lowers the contrast between the two sides; it does not change how hard or soft the shadow edge is, which is set by the size of the light rather than its brightness. It is a real improvement and the smallest of the three. Established practice is to run it noticeably dimmer than the first one, judged by eye rather than by a ratio, because a fill that matches the key cancels the shape you just spent an afternoon creating.
Before you buy one, try a white wall, a piece of foam board or a sheet on a chair, placed on the shadow side to bounce a little of your existing light back. It does the same job for nothing, and it will tell you whether you actually wanted a fill light or whether you wanted your key light moved.
What should you change first?
In order, and stop when it looks right:
1. Move the light out to about forty-five degrees. 2. Raise it above your eyeline and tilt it down. 3. Bring it closer and put something between it and you to spread it. 4. Move yourself away from the back wall. 5. Only then, consider a second light.
The first four are free. If you film weekly, do them once, mark the floor with tape, and stop thinking about it.
Where this stops being a lamp position
There is a point at which lighting stops being geometry and starts being a decision about what the video is for. A cook needs the hob lit as carefully as the face, because the hob is the lesson. A piano teacher needs the hands lit brighter than the room, because the hands are what people came for. On one music education partnership the fix was not a better camera, it was artificial light balanced specifically on the angle covering the fingers, because the fingers were the thing being taught.
That is the question worth asking before you buy anything: what is the one thing in this frame the viewer must be able to see? Light that, and let the rest of the room fall where it wants.
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