Infrared bulbs are more similar to polarized plastic covers that obscure the plate when viewed from certain directions. Not sure if they are illegal or not but they are definitely outside the purview of the FCC.

Nowhere in the United States of America are 'citations' sent by - usually private - speed/red light cameras considered criminal offenses.

Know why? They barely stand the requirements for civil infractions in most areas. Typically these 'tickets' are implemented as backwards preconditions-to-vehicle-registration.

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Actively jamming radar is a crime and could possibly net you trouble. Light? IR? No such 'unlawful interference' law exists at the federal level. You might be violating a state statute, but that's the extent of it.

Interfering with a civilly-implemented speed/red light camera via use of plate-obscuring equipment on your vehicle might be a state-level offense but it wouldn't be for long if challenged.