Abstract: The invention relates to a plant illumination device for exposing to light plants that are to be grown in a greenhouse, which plant illumination device comprises: at least one lighting fitting with a first light source, which first light source is an assimilation lamp in the form of an incandescent lamp or a gas discharge lamp, the first light source having a first spectrum, and said first light source having a power of at least 250 W; —at least one additional lighting unit (5) with an additional light source, which additional light source has an additional spectrum which differs significantly from the first spectrum, and in which the additional spectrum complements the first spectrum in at least a wavelength range which plays a role in a biological process in the plants to be exposed to light.

Abstract: A greenhouse lighting system comprising a greenhouse lighting fitting having a lamp holder (370) with an outer ring (371) provided in a cavity in the lamp holder; which can be electrically connected to a phase, and an assimilation lamp (140, 240, 340) which comprises a lamp cap (142, 242, 342) and a bulb and can be screwed into the lamp holder via an insertion opening. The greenhouse lighting system comprises an electrically insulating gasket (100, 200, 300) which is situated around the lamp cap of the assimilation lamp in such a manner that the lamp cap can no longer be touched with a finger when the lamp cap contacts the outer ring.

Abstract: The invention relates to a greenhouse lighting fitting that is in particular suitable for use in combination with an assimilation lamp. The greenhouse lighting fitting has a fitting body which comprises a fastening element for mechanically fastening the greenhouse lighting fitting to a part of a bearing structure, a reflector for directing the light emanating from a lamp fitted in the greenhouse lighting fitting downwards and a contact member for making an electrical connection with a lamp fitted in the greenhouse lighting fitting.

Abstract: The present invention relates to a method for illuminating plants in a greenhouse, comprising the provision of a lamp above the plants, with adjustment of the distance between the lamp and the tip of the plants growing upwards to the height of the growing plants, this distance being kept between 80 cm and 240 cm. The present invention furthermore relates to a greenhouse, containing plants and an installation for illuminating plants, wherein the installation comprises a lamp, lifting gear for moving the lamp in the height direction relative to the plants and control means for measuring and/or setting the distance between the lamp and the tip of the plants growing upwards, and also relates to an installation for illuminating plants intended for use in such a greenhouse.

Abstract: The invention relates to a glasshouse lighting power current cable for supplying electrical energy to assimilation lamps in a glasshouse. The glasshouse lighting power current cable according to the invention has at least three electrically insulated through conductors embedded in the cable for the transmission of three-phase current, the cable being provided with a plurality of connecting points distributed along its length, at which connecting points the conductors are exposed. The connecting points can each be provided with a connector, which connector can be connected to each of the conductors, the connecting points in each case being situated at a fixed, predetermined distance from each other.