Read the sheet in the order it is installed
Most outdoor gobo projector sheets list ten numbers and leave out the three that decide the result. Work from the wall backwards — image size, throw distance, ambient light — and treat everything else as supporting detail. The numbers that matter are the ones you can verify on site with a tape measure and a lux meter.
Output numbers, ranked by how much they lie
Wattage tells you the running cost, not the result. Two outdoor gobo projector models at the same wattage can differ by 30% at the wall because of lens efficiency and LED binning. What you actually care about is contrast: the image needs to be meaningfully brighter than the surface it lands on, and that is a lux comparison, not a lumen one.
| Figure | What it measures | How much to trust it |
|---|---|---|
| Lumens | Total light leaving the lamp | Rough sorting tool — ignores lens and gobo losses |
| Lux at the wall | Light arriving on the surface | The number that matters, rarely quoted |
| Watts | Power drawn from the supply | Tells you running cost, not brightness |
Throw distance and image size
Throw distance without image width is meaningless, and plenty of sheets quote only one. an outdoor gobo projector that throws 40 m might give you a 1 m logo at that distance or a 6 m one, depending on the lens — a difference that decides whether the install works. Always ask for the pair: distance and the resulting image size.
| Throw | Typical image width | Practical note |
|---|---|---|
| Short, around 8 m | 0.5 – 1.5 m | Bright and easy — most indoor work |
| Mid, around 40 m | 1.5 – 3 m | Where lens quality starts to matter |
| Long, beyond 40 m | 3 m and up | Contrast fails before reach does |
The optical spec most sheets leave out
The spec most sheets omit is the maximum artwork resolution the optics can resolve. an outdoor gobo projector with a good lens will render fine detail that a cheaper unit turns to mush, which means the limiting factor is often the projector, not the gobo. If your design has thin strokes, ask what line width the system holds at your throw distance.
The compliance block
IP65 is the number to check for anything outdoors, but read what it covers. The first digit is solid ingress, the second is liquid. IP65 on an outdoor gobo projector means dust-tight and protected against water jets, and it says nothing about the bracket, the gland or the connector, which are the parts that actually fail. Ask whether the rating covers the whole assembly or just the housing.
What a good supplier answers without hesitating
The most revealing question is about failure. Ask what the most common warranty claim on this outdoor gobo projector is and how it is resolved. A supplier who answers honestly is worth more than one with a slightly better spec sheet.
