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Careful tailoring of the lighting strategy based on crop/climate requirements, accounting for the heating effects of lamps in the climate control, developing/using more energy-efficient lighting, and switching to renewable/sustainable sources for the energy input for the lighting can improve the energy-efficiency of artificially-illuminated greenhouses. Apart from technical developments of light sources, energy savings could also be realized by adaptations of the technical layout and positioning of lights, such as combining top-lighting and inter-lighting.