Focusing Problem With Distracting Signal Lights?

A member asked in the IPVMU class today: "I have a scenario where I have PTZs and fixed low light cameras viewing rail track. Recently they installed blue led signal lights for switching and the camera wants to try and focus on those. Any suggestions on resolving this? We are using Bosch PTZs and fixed cameras (498s)." This seems like a tough one. Any ideas?
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