IP ratings (Ingress Protection) define how sealed a fixture is against dust and moisture. For outdoor or high-humidity use, you want at least IP65—common on professional outdoor moving head models
. IP-rated units allow more flexibility in rig placement and reduce maintenance risk: fixtures can be hosed after dusty outdoor events, and salt-laden sea air won't corrode housings. Remember to confirm gobo slots, lens ports, and pan/tilt joints are sealed—not just the main housing.