Any suggestions for how to fix or mitigate this so that the light appears as circular on the ground as possible? I suppose I could move the spotlight as high as possible, or use several spotlights placed evenly around the space and then use whichever is closest to the desired location. Just wondering if there is a simpler solution that I'm overlooking (perhaps a special kind of light).

I was also thinking I could use multiple gobos rather than just one, as I mentioned above. Basically there could be gobos for several angles, and the gobo is chosen that is closest to the desired angle.

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I'll be controlling the lighting programmatically via software, so I'm thinking the gobo solution would be the most straightforward because I can just have the program calculate which gobo will provide the most circular appearance for a given location, and use that one.

Spot Beam - Tighter, more focused light that prioritizes distance - for higher speeds or remote areas.

Fog Beam - Wide beam with a sharp vertical cut-off, making it street legal for foggy, rainy, snowy, or dusty conditions.

The purpose of the light is to direct people where to walk. Once they get to the beam on the ground, it can turn off, move to the next spot, and then turn back on, etc. In other words, the lights won't be moving while on.

Spread Beam - Provides a bright, wide beam that prioritizes peripheral visibility & clarity for off-road driving.

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If you must have an absolutely perfect circle, and you have no option but to have the source off the perpendicular, perhaps you'll need to have a gobo made which is in the form of an ellipse, with sufficient correction on the shape such that it shows as a perfect circle when it hits the ground. How's your trigonometry? http://www.blue-room.org.uk/public/style_emoticons/default/wink.gif

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I'm thinking I can go gobo-less when the light is pointing nearly straight down, then use a gobo to help correct the shape of the beam a bit when it's at more of an angle. It wouldn't be a perfect circle but it would be better than no gobo.

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Flood Beam - Typically used as work, scene, camp or back-up lights to see a broader area with a shorter distance.

A custom gobo would be the easiest way to do it, but it will only produce a perfect circle from the position you nominate the angle and distance when getting the gobo made.

Yeah that would make sense, but ideally the light could be moved to any location in the space rather than to one in a discrete set of a locations.

Just to provide some context, it's an indoor golfing setup in which the light shows you where to place your ball (I know this sounds bizarre). When you walk over to the light and place your ball in the center, it can turn off. The space will be fairly large, so without correction, if a light needs to point somewhere in the far corner, it will look a little ridiculous. It won't be perfect but there won't be spectators viewing this from above, either.

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How many of these positions have you got to light? Perhaps a profile mounted above each location would be simpler? Unless you have a mover sat around and no profiles this would be easier to program too.

Combo Beam - Combines different optics to create a balance of distance and width, such as with light-bars.

If you have your unit, and your distance and angle companies will do the maths and make the gobo work for you. But depending on how many you need it might be a bit much!

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How many of these positions have you got to light? Perhaps a profile mounted above each location would be simpler? Unless you have a mover sat around and no profiles this would be easier to program too.

Here's a quick guide to selecting the right beam pattern for your adventures. Check out our Buyer's Guide to Off-Road Lighting for more info. Flood Flood Beam - Typically used as work, scene, camp or back-up lights to see a broader area with a shorter distance. Fog Fog Beam - Wide beam with a sharp vertical cut-off, making it street legal for foggy, rainy, snowy, or dusty conditions. Wide‑40 Wide-40 Beam - Hybrid between fog and driving beam, perfect for off-road cornering. Driving Driving Beam - Street legal SAE/ECE lights that supplement primary headlights to provide better visibility. Spread Spread Beam - Provides a bright, wide beam that prioritizes peripheral visibility & clarity for off-road driving. Combo Combo Beam - Combines different optics to create a balance of distance and width, such as with light-bars. Spot Spot Beam - Tighter, more focused light that prioritizes distance - for higher speeds or remote areas.

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Here's a quick guide to selecting the right beam pattern for your adventures. Check out our Buyer's Guide to Off-Road Lighting for more info.

Driving Beam - Street legal SAE/ECE lights that supplement primary headlights to provide better visibility.

I want to use a movable spotlight to illuminate a circle somewhere on the ground in a large space. The problem is that unless the spotlight is pointing straight down, it will not show on the ground as a perfect circle, but rather an elongated ellipse.

How many of these positions have you got to light? Perhaps a profile mounted above each location would be simpler? Unless you have a mover sat around and no profiles this would be easier to program too.

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what about something like some LED tape or such on the floor instead, you can create you circle and it will light up. If you need "top" light it might be better to do a bit of soft focus so it is "almost" there.