The JAR' regulation are:
JAR-OPS 3.640 - Helicopter operating lights
Date: February 1, 1999
An operator shall not operate a helicopter unless it is equipped with:
(a) For flight by day:
(1) Anti-collision light system;
(2) Lighting supplied from the helicopter's electrical system to provide adequate illumination for all instruments and equipment essential to the safe operation of the helicopter;
(3) Lighting supplied from the helicopter's electrical system to provide illumination in all passenger compartments; and
(4) An electric torch for each required crew member readily accessible to crew members when seated at their designated station.
(b) For flight by night, in addition to equipment specified in paragraph (a) above:
(1) Navigation/position lights; and
(2) Two landing lights of which at least one is adjustable in flight so as to illuminate the ground in front of and below the helicopter and the ground on either side of the helicopter; and
(3) Lights to conform with the International regulations for preventing collisions at sea if the helicopter is amphibious.