The ProLight is a visual indication, to reduce user hazards. A robot designed for collaborative operation shall provide a visual indication according to robotic safety requirements R15.06 and ISO 10218. The ProLight indicates with blue light that the robot is in operation, with red light a human interaction necessary and white light that the Cobot is off/no operation. This visualization ProLight ring is retrofittable for all types of UR robots: UR3/UR3e, UR5/UR5e, UR10/UR10e, UR16e. Additionally the ProLight has round edges to protect user of sharp-edged UR tool interface. Generally the ProLight reduces hazard for users.