Installing a High Power Gobo Projector: A Site-Ready Walkthrough

What to check on the first visit

The three survey failures are power, surface and access. No socket within reach, a target surface that is glossy or patterned, and a mounting point that needs scaffolding to reach — any of these turns an one-hour high power gobo projector install into a two-visit job. All three are visible in ten minutes on site.

1. Nearest power and whether it is switched
2. Surface material, colour and ambient light at the working hour
3. Fixing substrate and bracket load
4. How the unit will be reached for cleaning

Getting the geometry right before it is fixed

Mounting height is a compromise between throw angle and accessibility. A high power gobo projector mounted flat-on to the wall gives the squarest image, but the further off-axis it sits the more keystone distortion you get — the image becomes a trapezoid. Keep the beam as close to perpendicular as the site allows, and prefer a position you can reach with a short ladder rather than a cherry picker.

1. Bracket rated above the fixture weight
2. Stainless fixings for exposed positions
3. Beam as close to perpendicular as the site allows
4. Position reachable without powered access

Aiming, zooming and focusing

Do the final focus at the hour the unit will actually run, with the surface at its normal temperature. A high power gobo projector focused on a cold wall at 9am can drift slightly as the housing warms, and on long throws that drift is the difference between crisp and acceptable.

• Confirm the geometry and tighten the bracket
• Zoom until the image fills the intended area
• Focus on the centre of the image
• Check the corners — soft corners mean an angled mount

Power, cable routing and switching

Fit the cable gland the right way up and leave a drip loop. Those two details prevent most of the water ingress calls on outdoor high power gobo projector installs. Then confirm the supply is switched and labelled, so the site team can isolate the unit without hunting through a distribution board.

1. Fixed, switched, protected supply
2. Cable gland rated for the environment, fitted with a drip loop
3. Run out of reach and out of the cleaning route
4. Connection point accessible without dismantling the unit

Test it the way it will be used

Test the way it will be used, not the way it was installed. Run the high power gobo projector at the hour it is meant to run, with the house lights at their normal setting, and look at the image from where the audience will stand. A unit that looks fine at 2pm in an empty room can be invisible at 7pm with the lights on.

1. Image sharpness at the centre and all four corners
2. Contrast against the surface at the working hour
3. Full duty cycle run without thermal cut-out
4. Housing temperature after an hour at full output

What the site team needs on paper

Write down the settings. A high power gobo projector reinstalled after decoration, or a second unit ordered to match the first, is only reproducible if somebody recorded the throw, the lens setting and the gobo reference. Put it in the site folder and send a copy to whoever will order the replacement.

• Throw distance and image width as installed
• Gobo reference and artwork file name
• Zoom and focus settings
• Supplier contact for re-cutting artwork