Three Dimmers, One Sunset: Lighting a Ghost Scene on a 5 kW Sanction
Your +2 Vocational Drama batch must stage a 35-minute Odia adaptation of a ghost story in the hall of a government higher secondary school in Cuttack. The hall is 18 m by 11 m with a 4.2 m ceiling and no fly bar. The electrical inspector has certified a sanctioned load of 5 kW. The dimmer rack has four channels, but channel 3 trips whenever it is loaded above roughly 20 percent; the other three channels are healthy. Inventory: 12 fresnels rated 500 W, 4 profile spots rated 650 W, 8 LED PARs rated 60 W, and two floodlights rated 1 kW. Six wall circuits exist, but only three are live and all three feed the same side of the stage. The script calls for a 20-minute dusk-to-night fade, a moonlit bedroom, and a ghost who must appear from nowhere in a blackout. The production budget is Rs 5,000, of which Rs 1,200 is already spent on costume fabric. The show is in nine days, and the electrician can give you only one four-hour session.
1. Build a workable lighting plan within the 5 kW limit. Show your load calculation and justify which scripted effects you sacrifice.
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Constraint first. If every unit were used at full, the load would be 12 x 500 W + 4 x 650 W + 8 x 60 W + 2 x 1,000 W = 11,080 W, well over 5 kW. So the plan cannot be a scaled-down version of a full rig; it must be a selective rig.
Calculation. A defensible base is 4 fresnels (2,000 W) for warm front light, 2 profiles (1,300 W) for the bedroom special and a downstage pool, and 8 LED PARs (480 W) for blue back and side washes: 3,780 W. That leaves about 1.2 kW headroom for a practical bedside lamp (60 W) and cable losses. Channel 3 should carry only LED PARs, never a 500 W or 650 W unit, because it trips above about 20 percent loading.
Sacrifices. Drop the full-stage 20-minute dusk fade as a single cue. Replace it with three visible states, cross-faded on the healthy channels: warm front plus low blue back, then warm front out and blue back up, then a single profile special. Drop the separate moonlight wash and use one profile with a homemade breakup mask, tested for heat safety. Drop the true blackout: it is not technically reliable on three circuits feeding one side, and a blackout that leaves a visible hot spot is worse than no blackout.
2. The director insists on a true blackout for the ghost entrance. Explain how you would stage the moment without one, and why your choice is defensible.
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Why a true blackout is risky here. With no fly bar, three live circuits on one side, and an audience close to the stage, a blackout will not hide the actor's movement. The dimmers take time to fall, the practical lamp may glow, and the ghost can be silhouetted by spill from the wing. The audience may also see stagehands reset.
Alternative staging. Keep the stage in a dim blue back-light state and place the ghost upstage in a shadow pocket before the cue. On the cue, snap the two profiles to a narrow downstage pool and bring the ghost forward into it while the blue back-light stays low. The ghost appears because the eye is pulled to the new bright area, not because the room is dark. A second option is a light-curtain effect: two LED PARs from low side angles create a bright vertical haze at the entrance, and the actor steps through it.
Defence. This is a staging solution, not a compromise of the dramatic effect. It uses the available channels, reduces the risk of a visible reset, and gives the director a repeatable cue that can survive a school-hall power fluctuation. The ghost's entrance becomes a reveal rather than a disappearance, which is theatrically stronger for a small hall.
3. The principal asks for a written safety note before the show. What load, cabling and heat decisions do you record, and what do you refuse?
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Record the load. List every unit, wattage, circuit and dimmer channel. Show the total for each cue state, not just the full-rig total. Keep at least 15 to 20 percent headroom below 5 kW. State that channel 3 is restricted to LED PARs only.
Record the cabling. All three live circuits feed one side, so cable runs must be kept off walking paths and covered with rubber matting or cable ramps. No daisy-chaining of extension boards. Earth continuity must be checked before the electrician leaves. The single four-hour session should be used for patching, focusing, and a full cue-to-cue, not for last-minute repairs.
Record the heat decisions. Fresnels and profiles must be at least 0.5 m from fabric, curtains and the costume rack. The homemade breakup mask must be metal or heat-treated, never cardboard near a hot lens. Practicals must be low-wattage LED, not filament lamps inside a confined set.
Refuse. I would refuse a true blackout that depends on a faulty channel, any load above the sanctioned limit, and any cable crossing an exit route. The safety note protects the students and gives the principal a clear basis for approving the show.