In order to achieve a signifi cant energy saving, WUR Greenhouse Horticulture and Delphy conducted research under a lighting system with Deep Red / Blue Top- LED. Objectives were consistent growth by uniform light level, improvement of fl ower size and stem weight and 25% saving on electricity. In the summer of 2016, the climate through LED and cooling using OPAC heat exchangers was nice for good quality roses. In the winter 2016/2017 the quality of the roses was strongly reduced by the occurrence of small leaves, many 7 leafl ets leaves and small buds. The colour of leaf, fl ower and stem became too dark and had a high thorn density. In spring these effects became less severe, with positive effect on quality. The reason for the quality deterioration has been extensively discussed. Temperature, cutting strategy and light spectrum are considered. Despite the quality problems, production in stems and kg per m2 was fi ne. The light use effi ciency in the full-LED test was similar to that of the SON-T test a year earlier. The energy saving for lighting achieved the desired 25%. However, more heat must be added to allow the crop to experience a higher temperature, especially at times when there is only artifi cial light
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