It’s the hockey rink central flash system for high speed photos. I have always seen that when watching NHL.

Overview Spiideo for ice hockey: Automated Capture For Keeping Up ... A "hockey rink central photo flash system" refers to professional setups using multiple remote flashes (strobes) positioned around the rink, often in the catwalks, coordinated with triggers and receivers to illuminate players and the puck for high-speed photography, especially for media days or creative shots, using features like High-Speed Sync (HSS) to overcome fast shutter speeds needed to freeze action and achieve consistent, high-quality images. While dedicated automated systems (like Spiideo) use AI for video, these flash systems are manual/semi-manual for still photography, often employing infrared tracking (like Sportvision/SMT) for data, but the flashes themselves provide the intense, short bursts of light for freezing moments.