Halving energy consumption in greenhouse horticulture with LED lighting Leo Marcelis, professor of Horticulture and Product Physiology at Wageningen University, has indicated that by using LED lighting, the energy consumption of tomato growers who grow vegetables in greenhouses can be reduced by as much as 50 percent. Eight PhD candidates and three postdocs have been appointed to conduct research into the possibilities in this area.
Switching to LED lighting
Initially, the switch from high-pressure sodium lamps to LED lighting would already result in a saving of 25 percent. It is expected that this saving will even maximize to approximately 30 percent in the coming years. However, Marcelis emphasizes that a large part of the savings to be realized also depends on the placement of the LEDs. By positioning them in a smart way, it would be possible to make optimal use of, for example, the different colors that LED lighting can produce. In addition, the intensity of the lighting can also be specifically adjusted. All in all, it would be possible to realize a neat energy saving of 50 percent and that is a very nice bonus!
Decoupling light and heat
Another important development is that LED lamps, unlike current lighting, do not become warm. This has the advantage that the lighting can no longer be placed exclusively above, but also between the plants. Which colour is best used in this situation is not yet known and is being further investigated. It goes without saying that vegetable growers will want to get the most out of the optimised photosynthesis.
Adjustment of the moisture balance
LED lighting also ensures that the moisture balance in greenhouses will change. The use of light colours has a direct influence on whether or not the stomata of plants open. In addition, it also has a significant influence on the resistance of the plants. By keeping the stomata of plants open more often to absorb more CO2, more evaporation is caused. This means more moisture in the greenhouses, which means that plants run a greater risk of developing fungal diseases. During cold and dark days, energy can be structurally saved by closing the stomata a little faster. The application of LED light could also possibly have a favourable effect on fungal diseases such as mildew and botrytis. Various business processes would also be addressed in the research.
Source: https://www.wageningenur.nl/nl/nieuws/Met-ledverlichting-energieverbruik-glastuinbouw-halveren.htm
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