Would these be legal to have in a ring around the camera?
There aren’t any rules regarding the brightness of external lighting on the robot. If you keep it to a level where it won’t pose a safety hazard of any kind you should be fine.
Well … Too bright? http://www.youtube.com/watch?v=iU0qYJpUovs
Unless the GDC actually puts a lumen cap on exterior lighting I don’t think it would really be classified as “too bright” unless other drivers at your event(s) start complaining.
You could always post on Q&A to be sure but I don’t expect you’d have a problem.