Stalls

Ø 4.00 m

Hall modelled from the theatre's own 3D survey (Matterport tour) and photos. Dimensions are estimated to about ±0.5 m; the survey files (.skp/.dwg) will replace this model.

Il Teatro della Luce · Teatro Goldoni, Livorno

A disc that filters the daylight

A single-colour translucent membrane, stretched in a 4 m aluminium ring and hung under Cappellini's glass lantern. By day the sun lights it and throws its colour into the hall. A ring of LEDs on the edge keeps it alive on grey days and with the velario closed.

At a glance

–Production cost vs €20,000

–Hung weight

–Disc in direct sun now

Object

Diameter Height Material Colour LED edge ring Show frame

Daylight · opening hours 10:00–18:00

Date Time Sky Velario Sun track

Disc seen from below

Daylight through the membraneLED edge ring

–Daylight on the disc

–Average luminance

–Share from LEDs

Membrane options · click a row

A true focusing lens is ruled out: it would concentrate the sun into a hot spot on seats and timber, a fire risk. The "lens" options shape light by colour and sharpness, never by focusing.

Suspension

Scheme

–Pull per cable

–Sideways pull on anchor

–Wire rope · safety factor

Anchoring detail · one of three points (scheme C)

Each point has two independent lines: a primary rope with a turnbuckle for levelling and a safety rope on its own clamp, slightly slack. Both clamp onto the steel beams that carry the lantern, in the roof space, about 0.5 m outside the glass. Each rope comes down through the joint between the vault rim and the lantern base. Nothing is drilled, glued or welded on site, so removal leaves no trace.

#	Part	Qty	≈ €
1	Beam clamp, Doughty T29870, WLL 1000 kg, flange 75–220 mm, no drilling. If the beam is timber or the flange doesn't fit: a 10 mm wire rope sling, 1000 kg, wrapped round it with a protective sleeve (example). bax-shop.co.uk	6	690
2	Shackle, bow, AISI 316, 8 mm, at the top and bottom of every line. RS · BETA 8225S · imnasa	12	300
3	Turnbuckle, eye–eye, M10, AISI 316, 220 kg, on the primary line only. It levels the disc within ±5 cm. leroymerlin.it (or a rigging supplier, with certificate)	3	60
4–5	Wire rope, 7×19, AISI 316, Ø 5 mm, MBL about 14 kN. Primary and safety lines, about 8 m each, cut to length after the survey. gsproducts.co.uk · RS (75 m reel)	~55 m	290
6	Rope ends: thimble and swaged ferrule, made up and load-tested by a rigging shop, which issues the certificate. RS · BETA 8209 kit (reference)	12	240
7	Lifting lug on the ring: 8 mm plate, two holes (primary + safety), bolted through the tube. Made together with the ring.	3	in ring
–	Paperwork: declarations of conformity, EN 13414 / EN 13889 certificates, and a rigging log for the theatre.		120
	Suspension hardware (budget line "Suspension")		≈ 1,700

Installation only: three 250 kg D8+ chain hoists, hired, hung from the same clamps (e.g. NEXT StageLIFT 2.5 D8+). The disc is assembled on the stalls floor, lifted, then transferred onto the wire ropes, and the hoists are removed. UK prices converted at about €1.15/£. Prices are indicative and checked online on 15/11/2026.

To confirm at the site visit: which beams exist above the lantern rim and their section; whether the joint between vault rim and lantern base leaves a clear gap of 2–3 cm for the rope; the loads the engineer allows on those beams. If there is no gap, fall back to scheme B (cornice) or anchor the ropes on the lantern's perimeter beam itself, if the survey proves it independent of the velario.

Hung parts

Production budget

Indicative 2026 market prices, VAT excluded, to be confirmed with quotes. Surveys, certificates and insurance sit inside the €20,000 cap (Art. 9, 11). No aerial platform is assumed: the disc is assembled on the stalls floor and lifted with hoists worked from the roof space. If a platform turns out to be needed, add €2,500–3,500.

Call requirements

Why not an LED wall

A round LED screen of this size needs custom or flexible modules, a processor and its own frame. It goes over the cap before surveys and rigging, weighs three to four times as much, and by day it would compete with the sun instead of using it.