Published July 18, 2026 · EasyStagecraft

How to Read a Lighting Plot: A Beginner's Guide for Teachers (2026)

A lighting plot is a scaled overhead drawing that shows every lighting fixture in a theatre rig — where it hangs, what it does, and how it connects to the control system. If you can read a lighting plot, you can brief student crew confidently, ask sensible questions of a hire company, and catch problems before bump-in day. This guide walks you through every layer of the document, symbol by symbol, in plain English.

Plot vs Rig: What's the Difference?

Teachers often use these words interchangeably, but they mean different things on a production desk. The rig is the physical collection of fixtures hung in your venue — the actual lanterns, cables, and bars. The lighting plot (sometimes called the light plot or hang plot) is the 2-D drawing that tells the crew how that rig should be built. Think of the plot as the recipe; the rig is the cooked meal. When a hire company quotes you a rig, they should also supply the plot so your team can replicate or adapt it.

The Legend: Start Here Every Time

Before you read a single fixture position, find the legend — usually a box in the lower-right corner of the drawing. The legend is your decoder ring. It lists every symbol used on the plot and what it represents. Common entries include:

• Fixture type symbols — different shapes for Fresnel, profile (ellipsoidal), PAR, LED wash, and moving head fixtures
• Channel number — the number you type into the lighting desk to control that fixture
• Dimmer or circuit number — the physical socket or dimmer rack outlet the fixture plugs into
• Colour/gel code — e.g., "L201" means Lee 201 (Full CT Blue); "R32" means Rosco 32
• Gobo code — a reference number for the metal or glass pattern inserted into a profile fixture
• Focus/purpose note — a brief label like "DS-C wash" (downstage centre wash) or "special — chair"

If there is no legend, ask the designer or hire company for one before you brief anyone. A plot without a legend is like a map without a scale.

Reading the Fixture Symbols

Each fixture on the plot is drawn as a standardised symbol positioned on a bar, boom, or floor position. Here are the four you'll meet most often in Australian school venues:

The symbol's orientation on the bar tells you the rough aim direction. A fixture drawn pointing toward stage left on bar two means it's focused left from that position — useful for checking whether a fixture is likely to cause glare into an audience sight line.

Channels, Dimmers, and Why the Numbers Are Different

This is the point that confuses most first-time readers. A lighting plot carries two sets of numbers for every fixture, and they rarely match.

• Channel number — the logical address you use on the desk (e.g., Channel 5 = "DS centre Fresnel"). The board operator types "5" and that light responds.
• Dimmer/circuit number — the physical outlet on the dimmer rack that the fixture is actually plugged into (e.g., Dimmer 12). The dimmer rack is typically in the wings or a dedicated cupboard.

The console's patch links Channel 5 to Dimmer 12. If something isn't working, your first question is: "Is the fixture plugged into the right dimmer, and is the patch correct?" Many school-venue problems live exactly there. When reading a hire quote, check that the quoted dimmer count matches the number of circuits in your venue — a 48-circuit rack can't run a 60-fixture rig without some fixtures sharing dimmers, which limits independent control.

Colour and Gobo Notes

Gel (colour filter) codes appear alongside each fixture symbol, usually as a small alphanumeric tag. The prefix tells you the manufacturer:

• L = Lee Filters (e.g., L103 Straw)
• R = Rosco (e.g., R80 Primary Blue)
• GAM = GAM Products

When ordering gel for a school production, take the code list directly from the plot and give it to your hire or supply company. Don't paraphrase — "a warm amber" could mean a dozen different products. Gobo codes work similarly: the plot will note a manufacturer catalogue number (e.g., "Rosco 77730 — Breakup Leaf"). If your hire company supplies the profile fixtures, confirm the gobos are included in the quote or you'll be cutting your own from aluminium foil on bump-in morning.

Focus Notes: What They Mean on Paper vs in the Room

Focus notes on a plot are intentions, not guarantees. A note that reads "tight special — piano SR" tells you the designer wants a sharp, small pool of light on the upstage-right piano. Whether that's achievable depends on your venue's hanging positions, ceiling height, and the fixture's beam angle. When you brief your student crew or a hire technician, share the focus notes so they understand the purpose of each fixture — it dramatically speeds up the focus session because the technician isn't guessing. Allow a minimum of three to four hours for a full focus session on a 40–60 fixture school rig; larger productions need half a day or more. Tie this into your overall timeline using a production schedule template for your school play.

How to Brief Your Student Crew Using the Plot

1. Print A3 copies. A4 is usually too small to read bar numbers clearly. Laminate one copy to keep at the rig.
2. Walk the legend first. Spend 10 minutes before bump-in going through every symbol and what it means. Students who understand the language work faster and ask better questions.
3. Assign ownership. Give one student the channel/dimmer spreadsheet and make them responsible for cross-checking the patch. Another student manages the gel cutting list.
4. Use the focus notes as a briefing script. Read each note aloud so students can visualise what the finished rig should look like from the audience.
5. Flag safety concerns early. Any fixture requiring work above 3 metres triggers your school's working-at-height procedure. Check your performing arts centre safety audit documentation before crew go up ladders or onto scissor lifts.

Reading a Hire Quote Alongside the Plot

When a lighting hire company sends a quote, lay it next to the plot and check four things:

• Fixture count and type match — every symbol on the plot should correspond to a line item in the quote
• Cable lengths are specified — a 15 m bar-to-rack run quoted as "standard cable" can blow out your budget if the rack is further than expected
• Dimmer capacity covers the load — add up the wattages on the plot; a 6 kW dimmer can't safely run three 2.5 kW parcans
• Consumables are itemised — gel, gobos, lamps (globes), and colour scroller media are often excluded from base hire prices

If you're building or adapting plots digitally, the stage plot software guide covers the tools available at different price points, including free options suitable for school budgets. EasyStagecraft's EasyStageManager includes a glossary of lighting and production terms that's worth bookmarking for exactly these conversations with hire companies and designers.

A Quick-Reference Checklist Before Bump-In

• ☐ Legend obtained and distributed to crew
• ☐ Channel/dimmer patch list printed and verified
• ☐ Gel codes ordered and cut to size
• ☐ Gobos confirmed included in hire or sourced separately
• ☐ Focus notes shared with lead technician
• ☐ Working-at-height risk controls confirmed
• ☐ Dimmer rack circuit count matches plot fixture count
• ☐ Focus session booked with adequate time (minimum 3 hours)

Learning how to read a lighting plot won't make you a lighting designer overnight, but it will make you a far more effective advocate for your production — one who can have an informed conversation with a hire company, spot a gap in a quote, and give student crew the context they need to do their best work.