The stock lighting styles that ship with Inventor assume a model of X cubic area or volume. You will more likely than not find that when applying a style to a model that is either significantly smaller or larger than the that default volume that the lights simply do not look “right”, either drowning out your model or highlighting a very small patch of it. Well, before you start moving the light origins there is a quick global change that you can make that may be just what you need.
As you can see from this image, the model is a bit larger than the effectively lighted area defined by the default settings in this lighting style. As I already pointed out, this can be corrected without touching the position of either of these lights by simply adjusting the global scale.
Upon opening the Lighting Styles dialog the last tab, named Position, has a Scale slider. Not surprisingly, by default it is set to 100%.
If this setting is changed, as it is here to 300%, then the position of all of the lighting elements in the scene is changed and the result is more in line with what I wanted.