Behind the Lighting Plot: How a Broadcast Rig Is Drawn Up and Proved

It starts with the room, not the fixtures

Every lighting plan I write begins with a visit to the space, and the first hour is spent looking up rather than at the set. Grid height, rigging points, the load each bar can carry, the position of the power distribution and the route a technician takes to reach a fixture all shape what is possible before a single lamp is chosen.

I measure what is actually there and compare it with the drawings we are given, because the two rarely agree. A ceiling void that looks generous on paper may hold ductwork that blocks a key position. A grid that is rated for the weight may have no safe access for refocusing between shows.

Alongside the measurements I ask who will operate the rig day to day. A plan for a two-person crew looks different from one for a full lighting department, and it is much better to learn that now than at the first rehearsal.

• Grid height and rated loads at each rigging point
• Power supply and where dimmer or distro racks can sit
• Access routes for focusing and lamp changes
• Daylight, windows and reflective surfaces on set

Turning a brief into a lighting plot

Once the room is understood, I draw the plot. This is a scaled plan showing each fixture, its position on the grid, its type, its channel and where it points. I build it in layers so the key light, fill, backlight and set lighting can be switched on and off in the drawing and discussed one at a time with the producer.

The brief usually arrives as a description of mood rather than a technical request: warm and approachable for a morning programme, crisp and neutral for a news desk. I translate that into colour temperature, contrast ratio and the number of positions each presenter needs to be lit from.

I also mark what the plot does not do. If a corner of the studio is used only occasionally, I note whether it is lit by a dedicated fixture or by borrowing from the main rig, so nobody assumes more coverage than the drawing shows.

Choosing fixtures for colour you can repeat

Fixture choice is where look and practicality meet. LED units have made colour control far easier, but two fixtures of the same model bought years apart can still differ slightly, and cameras are unforgiving about that. I advise on keeping fixtures from one batch where a single surface is lit from several directions, and on recording the settings used for each programme.

I pay close attention to how a fixture behaves when dimmed, because some shift in colour as they go down, and a presenter lit at sixty per cent should not look different from the same person at full. Fan noise matters too, particularly where microphones sit close to the grid.

Where a studio shares its floor between programmes, I prefer fixtures with reliable preset recall, so a change of set means loading a state rather than rebuilding it by eye.

• Matching units from one batch for shared surfaces
• Colour shift when dimmed
• Fan noise near microphone positions
• Preset recall for studios with quick turnarounds

Working with the camera side

Lighting is judged through a lens, so I work closely with whoever is shading the cameras. Before the plot is final we agree a target exposure for skin tones and the white balance the cameras will be set to, because a rig built for one setting is awkward to rescue later.

On a first test day I light a stand-in, usually one of the crew, and walk the camera operators through each shot. Shadows from a boom, flare from a low backlight and a reflection in a glass desk all show up quickly on a monitor and are cheap to fix at that stage.

I keep notes from these sessions with the plot, so the vision engineer and the lighting operator are working from the same record of what was agreed and why.

Proving the rig before the production crew arrives

A good plan still has to survive contact with the building. Before the full crew arrives, I run the rig through a simple sequence: every channel checked in turn, every fixture focused to its marked position, every preset recalled and compared with the plan. Faults found at this point cost minutes; found during rehearsal they cost much more.

I also check the practical side of operating the rig. Can a technician reach the fixtures that will need adjusting? Are the cable runs labelled in a way a newcomer could follow? Is there a spare of the fixture type most likely to fail?

The aim is a rig that behaves predictably, so the people running the programme can concentrate on the show rather than the lights.

• Channel-by-channel check against the plot
• Focus positions marked on the grid or floor
• Preset recall tested and compared with the plan
• Labelling and spares reviewed with the crew

Handing over something the crew can run

The last part of the job is the handover, and it is the part most often rushed. I leave the crew with the final plot, a channel list, the agreed colour and exposure settings, and a short note on how to return the rig to its starting state after a change of set.

Where it helps, I stay for the first programme to watch how the plan holds up with a live audience, a different crew member on the desk and the usual last-minute changes. Small adjustments made then tend to be the ones that last.

A lighting plan is finished when somebody who did not draw it can operate it, repair it and explain it to the next person.