Long Throw Gobo Projector Guide: Projecting Logos 50–200m onto Facades

Long-throw projection is a different engineering problem from a shop window: light loses roughly 75% of its intensity every time you double the distance, so throw distance, lens and raw lumens decide whether your brand reads as a crisp mark or a fuzzy glow.

Why throw distance changes everything

A gobo projector throws a fixed-size image determined by its lens and the distance to the surface. Move it twice as far and the image is four times larger but only one quarter as bright per square metre. At 150 m onto a stadium fascia, a 10,000-lumen indoor unit that looked punchy at 8 m will wash out completely.

Plan backwards from the wall: decide the logo diameter you need, then solve for lumens and lens rather than buying a bright box and hoping it reaches.

Lumens, lens and the inverse-square trap

For facades beyond 50 m, look at projectors rated in the 200 W–600 W class with dedicated long-throw optics. A narrow beam spread concentrates flux instead of spilling it into the sky.

As a rule of thumb, every 30 m of extra throw at a given lens needs roughly double the output to hold the same on-wall brightness. Build in 30% headroom for haze, ambient city light and dirty lenses.

0–30 m: 100–200 W class, standard lens
30–80 m: 200–400 W class, medium-throw lens
80–200 m: 400–600 W+ class, long-throw / narrow beam lens

Mounting and bracket access

Long throws are almost always mounted high — rooftops, crane arms, adjacent buildings — to clear obstacles and reduce pedestrian glare. Confirm the bracket is rated for wind load and that you have safe access for gobo swaps and focus adjustment.

Aim for a near-perpendicular hit; a shallow angle stretches the logo vertically (keystone) and thins the light, so factor a tilt-correcting lens or a steeper mount.

Power and signal at distance

Running mains 150 m to a rooftop is a real cost. Use outdoor-rated cable in conduit, protect against surges, and keep the driver unit dry. If mains is impractical, a high-capacity rechargeable unit shortens runtime but avoids trenching.

Ambient light and contrast

A lit city facade fights your logo. Project onto matte, unlit sections; schedule the strongest playback after dusk; and prefer white or single-colour gobos (they read better at distance than fine RGB gradients).

Quick spec checklist

Use this before requesting a quote:

Measure exact throw distance and desired logo height.
Note wall material, colour and existing lighting.
Confirm mount point, wind exposure and power access.
Pick lens class from the distance bands above.
Ask for an on-site brightness simulation, not just a lumen number.

Throw	Typical power	Lens	Watch-out
20–40 m	100–200 W	Standard	Glare on passers-by
40–80 m	200–400 W	Medium	Keystone from low angle
80–200 m	400–600 W+	Long / narrow	Power run & wind load

Common questions

How far can a gobo projector throw a logo?

Practical limits are around 200 m for a readable brand mark using 400–600 W long-throw units onto a dark, matte facade. Beyond that, brightness and cost rise steeply and a printed banner often wins.

Why does my logo look dim at distance?

Light follows the inverse-square law: double the distance and you get one quarter the brightness per area. You need more lumens and a narrower (long-throw) lens, not just a 'brighter' projector.

Do I need mains power for long throws?

Usually yes for 200 W+ units, run in conduit with surge protection. Rechargeable options exist but runtime drops sharply at high power, so they suit short events, not 24/7 building branding.

What lens do I need for a 100 m facade?

A medium-to-long throw optic in the 200–400 W class, with 30% lumen headroom for haze and ambient light. Ask the supplier for a throw simulation at your exact distance.

How do I stop the logo looking stretched?

Mount as close to perpendicular as possible. A shallow angle causes keystone; correct it with a tilt lens or a steeper mount rather than accepting distortion.

Can I project on a lit building at night?

Partially. Target unlit, matte panels and schedule the brightest playback after dusk. Single-colour and white gobos hold contrast far better than gradients at distance.