Lighting Plot Mistakes We See Most and How to Avoid Them

Mixing colour temperatures on one set

The most frequent note in a lighting review is mixed colour temperature. A set may combine tungsten-balanced fixtures, LED panels set to daylight and practical lamps on the desk, and the camera is then asked to make sense of all three. White balance can only be right for one of them, so skin tones drift and the background picks up a green or orange cast that the monitor in the gallery does not always make obvious.

The fix starts with a list. Write down every source that touches the picture, including windows, monitors in shot and set dressing, and note the stated colour temperature of each. Then choose one target, usually either 3200K or 5600K, and bring the others to it with correction filters or by adjusting the fixtures where they allow it. Check the result on a camera, not by eye, because eyes adapt quickly to a warm room.

• List every light source visible to the camera
• Pick one target temperature for the whole set
• Correct practical lamps as well as main fixtures
• Judge colour on camera, not by eye

Placing key lights where they cause shadows

Positioning errors tend to look small on a plot and large on screen. A key light mounted too high throws dark eye sockets under presenters, while one placed too close to the lens axis flattens faces and leaves nothing to shape them. Side lights set at the wrong angle spill onto the cyclorama or the next set and create a bright patch that no camera move can hide.

When we review a plot, we compare each fixture position with the camera positions and the marks where people will actually stand, not where the drawing assumes they will. A short walk-through with a stand-in on each mark reveals most shadow problems in minutes. Adjust height first, then angle, then distance, and change one thing at a time so you know which move helped.

• Check shadows with a stand-in on every mark
• Keep key lights off the camera axis
• Adjust height, then angle, then distance

Setting levels without thinking about the camera

Bright rooms feel professional, so there is a pull towards more light than the cameras need. Excess output forces a smaller aperture or a neutral density filter, narrows depth of field and makes the set feel flat and clinical. It also raises the heat in the studio, which presenters notice long before the picture shows any difference.

The better approach is to set a target exposure for the cameras you actually use, then light to that figure and no further. Measure at the faces, since faces are what viewers watch, and keep the contrast between the key and the shadow side within a range the camera handles comfortably. A review will usually suggest reducing some fixtures rather than adding any, which surprises people who expected a shopping list.

• Light to the camera's exposure target, not to the eye
• Measure at face height
• Reduce output before adding fixtures

Forgetting how the plot behaves over a whole show

A plot that works for a single locked-off shot can fail once the programme moves. Presenters walk between sets, guests sit in different chairs than rehearsed, and camera positions change for a wide shot. Lighting that was balanced for one position leaves a dark corner or a hot spot elsewhere, and the crew improvises with a spare lamp during the transmission.

We ask for the run sheet alongside the plot, because every change in blocking is a lighting change. Mark each set area with the moments it is used, and check that transitions between areas do not cross a pool of uneven light. Dimmer scenes, where the system allows them, are worth writing down in advance so the operator is not adjusting fixtures live while the programme is on air.

• Read the run sheet alongside the plot
• Check every walk between set areas
• Record dimmer scenes before the show

Leaving the background and set to chance

Background lighting is often treated as an afterthought, added in the last half hour of a rig day. The result is a set that looks lit from the front only, with presenters pasted onto a dull wall. Reflective surfaces such as glass, polished tables and metallic set pieces then catch fixtures and produce glare that the camera operator must frame around.

Give the background its own purpose in the plot. Decide whether it should separate the presenter from the wall, add depth, or simply sit quietly lower in brightness than the faces. Test reflective materials from each camera position before the day of recording, and angle fixtures so their reflections fall outside the shot. Small flags and barn doors cost little and solve many of these problems.

• Give background lights a defined job
• Test glossy surfaces from every camera angle
• Use flags and barn doors to control spill

Skipping a second pair of eyes before the day

Teams that rig their own studio every week become blind to its habits. A shadow that has been there for months stops looking like a problem, and a plot copied from the previous programme carries its old faults forward without anyone checking. Time pressure makes this worse, because the safest choice always seems to be what worked last time.

An outside review is useful precisely because the reviewer has no history with the room. We read the plot, the camera list and the run sheet, then send written notes on colour temperature, positioning and levels, ordered by how much they affect the picture. You decide which to act on, and the notes are written so a crew member can follow them without us in the studio.