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.

Abstract: A lithographic apparatus is disclosed that includes a substrate table holding a substrate, a projection system configured to project a patterned beam of radiation onto the substrate, a liquid supply system configured to provide a liquid to a space between the projection system and the substrate table, and a ring located such that it covers a gap between the substrate and the substrate table, the ring being in contact with the substrate and with the substrate table.