[DonRotolo]

1. Not very bright at all would be plenty. Think small flashlight, not 747 landing lights. Try a Radio Shack yellow LED, as long as it's mounted right at the camera, the retro-reflective tape will live up to its name.

2. I suggest using a spike, but there are other legal methods. Using the Pneumatic Solenoid bumper is NOT a legal method. The Digital Sidecar might not have sufficient current available to drive even a small LED.