Outdoor Projection Shows — Permits, Weather and Safety

Outdoor projection adds challenges that never appear in a studio: authorities, crowds, cables across public space, and weather. This checklist covers the essentials. Rules vary by country and city — always confirm locally.

Permissions

Building owner of the projection surface — written consent, including dates, times and content approval if required.
Projector position owner — the building, rooftop or land where equipment stands.
City or municipality — use of public space, events permit, temporary structures, road closures, street-light switch-off.
Heritage authority for listed buildings (usually about rigging and light exposure rather than the projection itself).
Noise permit for sound systems; laser permit where lasers are used.
Insurance — public liability and equipment cover.

Crowd safety

Even a "small" projection can draw thousands of people. Plan viewing areas away from traffic, keep emergency access lanes clear, consider barriers around equipment and towers, and coordinate with police or stewards for large events. Run shows in short loops so crowds circulate.

Electrical safety

Projectors draw significant power — a 30,000-lumen laser projector can draw over 2 kW. Use properly rated distribution, RCD protection, outdoor-rated connectors and cable ramps across walkways. Generators need fuel plans and exhaust placement away from audiences.

Projection towers and rigging

Scaffold projection towers must be designed for wind loading, ballasted and inspected. Define a wind speed at which the tower is evacuated or the show stopped. Projectors must be secured against vibration — movement ruins alignment.

Weather

Rain: use weatherproof housings with optical glass windows and drip shields; keep connectors off the ground.
Wind: besides tower safety, wind can shake projectors and pull the image out of alignment.
Fog and haze: light fog can create beautiful beams but scatters the image; heavy fog stops the show.
Cold: condensation forms when equipment warms and cools; heated housings help. Let equipment acclimatise.
Heat: projectors in sealed housings need ventilation or cooling.

Light pollution and neighbours

Avoid projecting into windows of residents, keep the beam on the target with careful masking, and inform neighbours in advance. Many cities have limits on show times.

Show-day checklist

Check forecast; agree go/no-go criteria.
Power-on and warm-up projectors at least 30 minutes before the first show.
Verify alignment and blend; re-warp if needed.
Test audio levels and emergency stop procedures.
Keep spare lamps/projectors, spare computer, backup media.
Assign crew to monitor equipment and crowd during the show.

FAQ

Do I need a permit to project onto a building?

In most places, yes — at least the building owner's consent, and often a permit for using public space. Projecting onto private property without consent can breach local laws.

Can projectors work in the rain?

Not unprotected. Use weatherproof housings with an optical window; many professional festival setups run through rain this way.

How do I protect the image from wind?

Use rigid mounting, ballast and tie-downs, and choose positions sheltered from gusts. Some systems re-calibrate automatically with cameras.