So, I have found a light sensor, which I think detects light levels, but, is there a color sensor for Vex Competition legal for Nothing but Net?
Okay so the light sensor detects reflected light levels. The rules specifically permit a color filter to be used. An orange color filter would allow for an easy distinction between orange and green balls using the VEX light sensor.
ps: Do you mind if I ask what you mean by “Three-time Worlds Winner!” ? Several of your questions sound like someone new to VEX and I do not believe I have heard of your team name before.