WJ Fountain's water screen range

The three:

• Water screen film projection — a high-definition projector throws video onto a fan-shaped curtain of atomised water.

• Water curtain laser show — a laser projector draws vector graphics and beams onto and through that same curtain.

• Digital Water Curtain — a wall of individually switched water droplets that forms text and images out of falling water itself, with no projection at all.

They can be combined, and on large projects they usually are. But the decision about which one carries the story should be made at concept stage, because it changes the civil works, the power budget, the operating crew and the content pipeline.

Side-by-side comparison

Film projection: the story engine, and the diva

A Water Screen Film Show is still the most emotionally powerful option. A recognisable character or a locally meaningful story, projected 15 metres high over a lake, does something a light show cannot.

The engineering constraint is brightness. A water curtain is a diffuse, semi-transparent, moving surface that reflects maybe 15–25% of the light that hits it — and it is never perfectly flat. Practical guidance:

• Projector power: allow 2,000–3,000 lumens per metre of screen width for a usable image at 15–20 m throw. A 20 m screen typically wants 40,000–60,000 lumens of installed capacity, split across two projectors for redundancy.

• Throw distance: the ratio of throw to screen width should stay between 1:1 and 1.6:1. Closer than that and edge focus collapses; further and you lose brightness.

• Darkness: the surrounding area must be controlled. Competing floodlights, shopfronts and street lamps within the projection cone will wash out the image. Plan the site lighting at the same time as the screen.

• Wind: above roughly 3 m/s, the curtain tears and the image smears. Sites with a long fetch need either a sheltered alignment, a taller nozzle array with denser overlap, or an acceptance that the film segment runs only on calm nights.

Screen nozzles are the maintenance item that surprises operators most. A 20 m screen may use 60–120 nozzles running at 4–6 bar; each one must be clean, matched and correctly angled or a visible band appears in the image. Build a nozzle cleaning routine into the weekly schedule and keep spares on the shelf.

Laser: maximum impact per yuan, minimum content cost

A water curtain laser show inverts the economics of film. There is no video to produce — content is vector graphics, often built from the client's logo and a handful of motion presets. That makes laser the cheapest technology to launch and the easiest to refresh seasonally.

What laser does better than anything else:

• Beams in atmosphere. Combined with fog or mist, laser beams become visible volumes of light. A water curtain in the middle of the beam path produces the signature "light through water" effect that audiences photograph.

• Geometry. Perfect circles, grids and outlines that read cleanly at 100 metres.

• Synchronisation. Laser scanners respond in microseconds, so graphic hits land exactly on the beat.

Limits to state plainly in the specification:

• No fine detail. Laser is a line medium. Faces, textures and gradients do not survive.

• Safety. Audience scanning is heavily regulated and often prohibited. Specify a projection zone with physical clearance and a beam-stop interlock, and follow the applicable laser safety standard (IEC 60825 series in most markets).

• Perceived repetition. A 5-minute laser sequence that thrills on night one feels familiar on night thirty. Budget for content refreshes.

Digital water curtain: the medium nobody expects

A digital water curtain uses a row of fast-acting solenoid valves. Switch them on and off in sequence and you "print" a falling pattern — letters, brand marks, a countdown. There is no projection, no screen, no darkness requirement.

Where it wins:

• Commercial and architectural settings — mall facades, hotel lobbies, exhibition entrances, corporate campuses. Places where the show runs all evening in ambient light and where a 4-minute narrative film is not what the space needs.

• Sponsor and text content. Changing a message is a text edit, not a video production. For retail and event venues this is the whole business case.

• Windy, exposed positions. A dense, short droplet wall holds its shape where a projection screen would dissolve.

The engineering caution is water quality. Every valve orifice is small, and every orifice will eventually see scale, silt or biofilm. Specify staged filtration, a water treatment regime, and a valve access design that lets a technician replace a solenoid from the front of the array without dismantling the manifold.

Combination architecture: which one carries the story?

The practical answer on mid-size and large projects is a layered show:

1. Water curtain film carries the narrative — the 6–8 minute story segment, brand film, or heritage piece.

1. Laser carries transitions and climax — fills the gaps while the film screen re-forms, and provides the visual peak.

1. Digital water curtain carries messaging — sponsor logos, event titles, greetings, and the pre-show loop that runs before the main show.

This layering also solves an operational problem: if the projector fails, the site can still run a laser-and-text show the same evening. Sites with a single technology go dark.

Cost drivers, ranked

If budget is the constraint, these are the levers in order of impact:

1. Screen size. Cost scales faster than linearly with width — nozzles, pump capacity, projector lumens and structural support all rise together.

1. Content production. A bespoke 8-minute 3D film can cost more than the hardware. Reuse, license or build in vector.

1. Redundancy. Dual projectors, dual pumps, backup laser — worth it for ticketed venues, optional for free public squares.

1. Water treatment. Skipping it saves money at build and costs more in year two.

Specifying the show

Bring four things to any supplier conversation and the proposals become comparable: the audience viewing distance and angle, the ambient light at show time, the prevailing wind, and whether the content will be narrative or graphic. Those four answers determine the technology before any price is discussed.

WJ Fountain's water screen range

WJ Fountain builds all three technologies in-house — water screen film shows, water screen laser light shows, custom laser water screen fountains, magic water screen movie shows and digital water curtains — and will recommend the combination that suits your site rather than the most expensive one. Systems ship as a single package with matched pumps, nozzles and control, typically delivered within 60 working days.

Send us your site plan, audience layout and a reference image of the effect you want, and we will respond with a technology recommendation and a show timeline.

About WJ Fountain Wuxi Wenjin Fountain Engineering Co., Ltd (WJ Fountain) is a China-based music fountain manufacturer and water-feature engineering company founded in 1999. With a 50,000 m² plant, 500+ staff and 30+ years of core expertise, WJ Fountain designs, builds and installs music fountains, water screen projection shows, laser fountains, digital water curtains and dry floor fountains worldwide, typically within 60 working days, shipping FOB via the Port of Shanghai.

Media Contact WJ Fountain (Wuxi Wenjin Fountain Engineering Co., Ltd) Address: No. 3, Nanxin East Road, Heqiao Town, Wuxi, Jiangsu, China Tel / WhatsApp: +86 13812078746 | Email: shen_zhw@163.com Website: www.wjfountain.com