From Plot to Patch: How a Lighting Plan Gets Built

Starting with a walk round the empty room

Every lighting plan we write begins in the space itself, before anything is drawn. We arrive with a tape measure, a laser distance meter, a notebook and a camera, and we spend the first hour simply looking. Where is the ceiling grid, and how much weight can each bar take? Where are the power distribution points? Which walls are painted, which are curtained, and which will reflect spill light into a shot?

We also ask the people who work there what annoys them. A floor manager will tell you within minutes that the left-hand desk always looks green on camera, or that one fixture has to be refocused every morning because it drifts. Remarks like these rarely appear in a specification, yet they often point to the real problem. We write them down in the operators' own words and return to them when the plot is finished, to check each complaint has been answered.

• Measure grid height, bar spacing and rigging points
• Note existing power, dimmer racks and cable routes
• Record wall colours, windows and reflective surfaces
• Collect the crew's own list of recurring problems

Deciding what the camera needs to see

Before choosing a single fixture, we agree with the producer and director what the picture is for. A two-person news desk, a panel with five guests and a standing demonstration area each ask for different things. We sketch the camera positions and the frames they will hold, because light is placed for a lens, not for a room. A beautiful look from the gallery window means nothing if the camera never faces that way.

From those frames we work out the subject positions and how far people actually move. Guests who lean forward, presenters who walk to a screen and chairs that swivel all change where the key light must fall. We prefer to plan for the movement we have seen rather than the movement a script describes, and we say so plainly in the notes that go with the plot.

Placing key, fill and back light

With frames agreed, we place the key light for each position first, usually about forty-five degrees off the camera axis and slightly above eye height. Then comes the fill, set to control contrast rather than remove shadow entirely, and the back light, which separates the subject from the set. We keep a short list of rules of thumb, but we treat them as starting points and test them against the actual faces and clothing involved.

The set itself gets the same attention. Walls, desks and graphics panels are lit on purpose, with their own fixtures where possible, so that adjusting a presenter's light never changes the background. Where the budget does not stretch to separate background lighting, we say what will be compromised and let the client decide, instead of hiding the trade-off inside a tidy drawing.

• Key light first, fill second, back light third
• Light the set separately from the people where possible
• State every compromise in writing

Drawing the plot and the fixture schedule

The plot is a scaled plan showing each fixture, its position on the grid, its type, its focus point and its channel number. Alongside it goes a schedule listing every fixture with wattage, accessories, gels or filters, and the camera position it serves. We draw it so that someone who never met us can rig the grid from the paper alone, because that is exactly what happens when the person who visited the site is away.

We try to keep the drawing readable rather than impressive. Too much detail on one sheet makes errors harder to spot, so large sets are split into a grid plan, a floor plan and a section view. Each sheet carries a revision letter, and we number changes so that nobody rigs from an out-of-date copy, a mistake that costs more time than most technical faults.

Dimmer patching and keeping loads honest

Patching is the quiet, unglamorous part that decides whether a rig is pleasant to operate. We assign fixtures to dimmer channels and control addresses in a logical order, grouping by position or purpose so the operator can find the left key light without searching. We then add up the load on every circuit and every dimmer, leaving headroom instead of running anything at its limit.

The patch sheet lists each channel, its dimmer, its circuit, its fixture and its location, in a table that can be pinned beside the desk. We also record the default levels for each scene preset, so a new operator can bring the studio up to a sensible look on the first morning. If the console allows it, we suggest labels that match the names the crew already use, not ours.

• Group channels by position or purpose
• Check load per dimmer and per circuit
• Leave headroom on every channel
• Label channels in the crew's own words

The handover and the first rig day

We prefer to be in the room when the plan is first rigged. Plots rarely survive contact with a real grid unchanged: a bar is a few centimetres out, a cable run is longer than drawn, a fixture turns out to clip a set piece. Being present lets us correct the paper on the spot, rather than leaving the crew to improvise and forget to record it.

Afterwards we issue the final plot, schedule and patch sheet with every correction included, plus a short note on how to refocus and what to check weekly. Cold weather and darker mornings in these weeks mean more studios are lit earlier in the day, so we also suggest a quick check of any fixtures that have run long hours since the summer.

A good lighting plan is mostly careful, ordinary work: measuring the room, understanding the frame, placing light with a reason and writing it all down so others can follow it. None of it is mysterious, and none of it needs to be hidden from the crew who will live with the result. If your studio keeps fighting the same shadow or patch confusion, a plot and a clear patch sheet are usually where the fix begins.