I believe that it is legal for a PLL with a VFRN rating to fly at night in the Netherlands, because it is ruled in JAR-FCL 1.175 b:
JAR–FCL 1.175 Circumstances in which an IR(A) is required
(a) The holder of a pilot licence (A) shall not act in any capacity as a pilot of an aeroplane
under Instrument Flight Rules (IFR), except as a pilot undergoing skill testing or dual training,
unless the holder has an instrument rating (IR(A)) appropriate to the category of aircraft
issued in accordance with JAR–FCL.
(b) In JAA Member States where national legislation requires flight in accordance with IFR under specified circumstances (e.g. at night), the holder of a pilot licence may fly under IFR, provided that pilot holds a qualification appropriate to the circumstances, airspace and flight conditions in which the flight is conducted. National qualifications permitting pilots to fly in
accordance with IFR other than in VMC without being the holder of a valid IR(A) shall be restricted to use of the airspace of the State of licence issue only.
Inbalance