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Improved wording...
I realized that my second requirement for a light rule was not sufficient to define things fully.
I propose the following rule for comments:
1)
The light must be oriented in such a manner that it is expected to have its base pointing downward the majority of the match (more than 60 seconds).
2)
For any horizontal plane higher than 2 ft, draw a circle 20 feet in diameter and centered about the point where a vertical line through the center of the bulb intersects the plane. The light must be clearly visible from at least at least 300 degrees around the circle and it must have no single "blind spot" larger than 45 degrees.
3)
For brief periods of time (for example going under the bar, moving an elevator mechanism to lift a crate, etc.), the light may be partial obscured without violiating the spirit or letter of this rule -- which is to ensure that the audience can easily (and at almost every instant) determine the color designation of each and every robot on the field.
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