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This is from https://www.pegasuslighting.com/lc-lighting-design/track-lighting-101.html, and it seems to work.
"Measure the distance from the ceiling to the middle of the object being lit. Multiply that number by 0.55 to determine how far away from the wall you should place the track fixture. For example, if you are providing accent lighting for a painting that is three feet below the ceiling (measured from the ceiling to the middle of the painting), you should place the track fixture 1.65 feet away from the wall.*
After you’ve determined the distance from the wall, position the track fixture so that the light makes a 30-degree angle with the wall/vertical surface you are trying to light up. This is the optimal distance to prevent glare and minimize shadows.
*If you are lighting any object that has the potential to produce direct glare (such as a photograph with a glass frame), do not place the track lighting any further than three feet from the wall."
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