Three different types of lights can be placed in your model: Spot, Point, and Distant. Each of the New Light Settings commands prompt you to specify a position (using either standard three dimensional placement or a data point in any graphic view) and size of a new light, and then displays the corresponding light dialog box.
The physical location for the lights is as follows:
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For point lights, the center of the spherical glyph.
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For distance lights, the neck of the arrow glyph.
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For spot lights, the neck of the flash light glyph
You cannot change the type of light after placement. To change a spot light to a point light, for example, you must delete the spot light and then place a new point light.