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The difference is that for camera tracking you typically want a somewhat wider spread light which is more likely to bother people (unless of course you're shooting from far enough away to allow you to limit the spread). Using a highly directional photon cannon pointed up shouldn't bother many opposing drivers. Its just the people up in nosebleed seats that will get blasted.
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The way I look at it, the spread of the light determines how many people it impacts. The brightness of the light determines how much it affects the people with the light in their eyes. The teams I'm familiar with that did this last year shined it on the floor, wall, ceiling, and everything in between. I'm not saying it was a bad strategy, but the lights were far far brighter than the LEDs.
Heres another way of looking at this. The retroreflective material is graded by how much more light it reflects than white paint. I believe the material used is at least 300x brighter. That means it only takes 1/300th the intensity of light when used properly.
Greg McKaskle