Patent ID: 8350490
Filing Date: 2013-01-08
Classification: A01G,Y02P

Abstract:
1. A lighting installation for use in greenhouse farming for lighting crops in a greenhouse, comprising a number of light sources, provided above the crops to be lighted, and a number of dimmer devices for the light sources, whereby the dimmer devices are provided with control means for periodically, automatically varying the light intensity of the light sources cooperating with the dimmer devices according to a predetermined pattern, wherein the light sources are divided into a number of groups, characterized in that the lighting installation being designed such that, in use, power of each group varies according to a predetermined pattern, while patterns of different groups are phase-shifted to each other such that the electric power consumed by joint groups varies less than the power variation of a single group, or such that the electric power consumed by the joint groups varies to a smallest possible extent, or does, at least virtually, not vary; the installation is at least provided with a first group of light sources and a second group of light sources, while the phase shift between the pattern of the first group and the pattern of the second group is at least virtually equal to a half period of the pattern.