Vision Processing - How Bright is Too Bright?

[Jaci]

A huge percentage of Robots this year (that go for the high goal) are using Vision Tracking in order to acquire the target. It's great to see people diving into the world of Vision Tracking and with the release of the GRIP Computer Vision Engine, it's good to see this is getting more accessible.

But about those bright, blinding Green LEDs. How bright is too bright?
I've seen teams use 1 ring all the way up to 4+ rings, providing a power that rivals that of the sun itself. Of course, a visual light is needed for (most, hint hint) vision systems to acquire the retroreflective target, and green is the most suitable hue for that, but how bright do you need it to be before it becomes a nuisance?

Some things to consider:
1) Blinding the audience
2) Sensor Bloom on Recording Cameras / Your own Vision Tracking System
3) If the green light reflects off of the tower itself, it could distract other robots with a weaker light (it's still a green hue, and with 4+ rings, you could light up a small forest).
4) Distracting drivers on the opposite alliance / Field Staff (see: Blinding)

I suspect in some configurations, there may be violations of R9-A and R9-C.

How much light do you think is needed before it becomes "Too Bright"?