A system for making the growth conditions for grass plants and similar plants more favourable, which plants form part of an outdoor/indoor grass pitch/utility lawn area of natural grass in the form of a football pitch (12) or similar sports/athletics arena formed from grass, which system comprises a travelling lighting unit (16) that in addition to light sources (15) may be equipped like a greenhouse/hothouse with a supply of water/air etc., characterised in that the lighting unit(16), the periphery of which is preferably designed and dimensioned so as to essentially correspond to the grass pitch that in addition to any other treatment is to be lit artificially, can travel in the heightwise direction between a lowermost, active position in which the grass pitch is lit and an uppermost, inactive position by means of a hoisting apparatus (10, 20, 22, 24, 28;
- 34, 20, 36) connected with the lighting unit (16), which hoisting apparatus is designed to initiate the required motion operations of the lighting unit (16).