(Quoted from Nazdar Ink Technologies. Full article here.)

Nazdar's UV-LED inks have been specifically formulated to cure at 395 nanometers (nm). In general, UV-LED systems have a tolerance range of +/-5 nm and an nm output curve that is relatively narrow but spans approximately +/- 15 nm. The initiators selected for UV-LED inks target this range, but are also reactive outside this range. This means that UV-LED inks should be reactive to both UV-LED and mercury vapor curing systems. This may vary to some degree depending on the specific ink's color and pigment load.

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