Start with the throw distance
The first number to fix is the throw. A long throw gobo projector rated for 20–80 m covers a very different wall at the near end than at the far end, and the image width roughly triples across that range on a typical zoom lens. Measure from the realistic mounting point — the one the site will actually let you use — and write it down before you look at any product page.
- Throw distance from the mounting point the site will allow
- Required image width at that distance
- Surface material and colour
- Whether the beam can be square to the surface
Brightness is a question about the room, not the lamp
Match the output to the darkest hour you care about, not the brightest. If the long throw gobo projector only has to work after sunset, 100 W may be generous; if it has to hold up against a shop window at 4pm, you are looking at the top of the 100–400 W range and still managing expectations. Overbuying power to solve an ambient light problem is the most expensive way to fix it.
- Ambient light on the surface at the hour of use
- Surface reflectance — matte white gives the most back
- Image width, since halving the area doubles the brightness
- Whether the unit has to compete with daylight
Lens, zoom and focus
Ask two questions about the lens: what is the throw ratio range, and can focus be locked. A long throw gobo projector with a 3:1 zoom will cover 20 to 80 m from the same bracket, but only if the focus mechanism holds its setting once the housing is warm and the site has been vibrating for a month.
What your artwork forces you to buy
One practical test: look at the thinnest stroke in the design at the size it will be projected. If it is under a couple of millimetres at the wall, a cut metal stencil will not hold it and a glass gobo is required. That single check prevents the most common long throw gobo projector disappointment — a logo that looks perfect in the proof and falls apart in light.
Where it lives matters as much as what it does
The ingress rating is a statement about where the unit can live, not how good it is. IP67 on a long throw gobo projector means it will cope with the conditions it was tested for — driving rain, dust, or in the case of indoor ratings, nothing more than a wipe-down. If the install is under a soffit that only sees wind-blown rain, an indoor-rated unit may be fine; if it is exposed on a tower base, IP67 is the floor, not the target.
- Is the position exposed to driving rain or only wind-blown moisture
- Whether the cable gland is rated with the housing
- UV exposure on painted finishes and plastic parts
- Salt or pollutant load in the air
What to send when you ask for a quote
The fastest quotes come from the most specific enquiries. Include the mounting height, the distance to the target surface, whether it is indoor or exposed, and the artwork in vector if you have it. A long throw gobo projector specification built from those details can be quoted and shipped without a second round of clarification.
- Throw distance and mounting height
- Required image width
- Surface description and colour
- Ambient light at the hour of use
- Artwork file, vector if available
