Praktijkproef LED Alstroemeria : invloed licht spectrum op bladkwaliteit : bouwstenen voor energiebesparing

Energy efficient cultivation of Alstroemeria requires more than just saving on heat. The total energy demand could be reduced by 40% if saving on lighting is possible. LED lighting can save 20% thanks to the higher efficiency of lamp and installation. If the morphology and quality of the foliage can be improved by manipulating the spectrum of the artificial light, then light interception and photosynthesis efficiency could improve too. The test at a commercial farm in winter 2013/2014 showed that plants grown under the conventional High Pressure Sodium lamps or under LED lamps (spectrum Valoya R300 AP67) did not differ in production and quality; this gives opportunities for energy savings with LED. The spectrum of Valoya R300 AP67 gave a slightly higher conductance of stomata and a higher photosynthesis was measured immediately after the dark period. However, this did not result in a higher production, more flowers or greener leaves, but it lead to a modest reduction in the number of necrotic leaf tips. The photosynthesis measurements suggest that low leaf temperatures in combination with long artificial light period may negatively influence leaf quality. A test with better insulation (transparent second screen) combined with dehumidification and shorter light period is therefore recommended.