Compliance with the requirements of standard EN 61547 "Equipment for general lighting purposes - EMC immunity requirements" demonstrates that luminaires and luminaire equipment are not susceptible to external interference emitted by other consumers.
Interference immunity testing consists of generating defined interference, to which the luminaire is then exposed. The luminaire's "reaction" to this interference is the basis for its immunity rating.
Interference immunity testing signals are distinguished by their transmission path (conducted or radiated), by their signal shape (continuous or pulsed) and by their frequency (low- or high-frequency).
Conducted interference signals are transmitted directly to the mains connection, signal and control inputs or external lamp connections.
In testing for radiated interference immunity, luminaires are exposed to a pre-defined generated interference field. Electrostatic discharge effects on the luminaire are also tested. The latter test is especially relevant for LED luminaires since the operated LED semiconductors can be at high risk of electrostatic discharge in adverse luminaire constructions.
The effects of the test signals are rated in levels. Rating level A, for example, means that the luminaire’s visually perceived luminous intensity does not change during testing with standardised test signals, and available regulation and control devices function properly. A level B rating in contrast allows for a change in luminous intensity, which, however, has to normalise on its own.