The Dutch horticultural research LED lighting lighting
The Netherlands is located in north latitude 52 o, and influenced by the Atlantic ocean, wet weather, therefore, limit the Netherlands facilities alone the most important environmental factors for the development of gardening industry.
Over the years, a lot of research on the Dutch horticultural scientists concluded that a law, that is 1% increase in the greenhouse light means increasing the output of 0.5 1%, based on this, artificial lighting is widely used in horticultural production.At present, more than 3000 hectares of greenhouse installation have artificial light supplement system, to promote production has played a pivotal role.At first, the artificial lighting system is mainly used in seedling production of cut flowers and potted flowers and crops.In recent years, its application in fruit and vegetable crops production also gradually increased.Artificial light supplement in addition to improve crop yield, also can guarantee the anniversary production, to meet the market demand and improve the efficiency of greenhouse.The Dutch winter natural light are too weak to meet the needs of crop growth, usually, the Dutch tomato planting in the middle of December, the following year began in March, harvested production until mid-november.However, due to the low light intensity and shorter in winter, the accumulation of natural light in December 10 times lower than in June, so artificial fill light is mainly used in winter crop production, ensure the anniversary of the horticultural products supply.
The Dutch horticultural facilities artificial lighting is given priority to with high pressure sodium lamp light source.The spectral composition of high pressure sodium lamp has appropriate and high energy conversion efficiency.Current, high pressure sodium lamp can realize energy conversion efficiency of energy input and output of 1.9 per watt 靘 ol m2S1 photosynthetic light effectively.High pressure sodium lamp is widely used in fruit and vegetable class and in the production of cut flowers (figure 1).In spite of this, one of the biggest challenges faced by artificial light supplement is still low energy efficiency and high cost problems.To solve this problem, the relevant scholars to carry out a series of research work, such as optimization of artificial fill light cycle, light intensity and for different varieties of crops and to explore different lighting solutions, improving artificial light supplement measures, etc.Dutch scholar has proposed moving light source lighting concept, although mobile light source can save investment cost to a great extent, but its application is still controversial, because there is no sufficient evidence in the mobile light fill light horticultural crop yield can be achieved under the condition of fixed light source under the condition of the same production.
In recent years, the Dutch for leds in horticultural facilities related scholars conducted a lot of research work in the field of application, a series of research results, such as to systematically explore the plant photosynthetic light response mechanism, and the influence of environment light morphogenesis etc., these to drive the LED in the application of horticultural production is of great significance.
In recent years, the Netherlands related to academics for LED applications in the field of Horticulture conducted a lot of research work, made a series of research results, such as the systematic exploration of the photosynthesis mechanism of plant response to light quality, light quality and light morphogenesis The impact, which is of great significance for promoting the application of LED in horticultural production.