I don’t think I’ve ever seen these suggested as a Vex part, but I think they would be a great addition along the same lines as the Speaker. They could provide visual feedback during matches, just as some teams use the speaker for audio feedback, and would promote more intelligent programming to take advantage of sensors during driver-control by many teams.
The current vex LEDs are good, but it’s too much trouble to wire a bunch together and just a few isn’t high enough visibility to be effective during a match.
*Probably not the correct specs, but they were the first thing to come up on google for an example
Line follower measures the infrared reflection of the surface, which is basically the color of the surface. It is little affected by lighting and is a pretty stable sensor. I have seen teams using lighting decorations in tournaments and they are legal. But I am not sure about those that are intended to distract opponents’ sensors~