With the LED lighting applications gradually expanded, more and more industry attention to LED biometric business opportunities. In Canada, for example, the annual sales of fruits and vegetables in the greenhouse are more than $ 1.1 billion, and how to provide effective lighting for the greenhouse is the key to supporting greenhouse cultivation and improving revenue.
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LED to replace the traditional high pressure sodium lamp to help plant growth
In terms of yield, even under moderate temperature, adequate nutrient and water conditions, greenhouse cultivation will still be affected by limited lighting. Researchers at McGill University in Canada argue that the current way of adding light to greenhouse cultivation, such as traditional high pressure sodium lamps, is not the most effective light source for plant growth, and is actively seeking alternative lighting.
Researchers point out that the light required for plant photosynthesis has a wavelength of about 400 nm to 700 nm, especially in the blue and red regions, closest to the plant photosynthesis efficiency curve. They believe that growers can use LED plant lights, according to the needs of a specific wavelength of light combination, the light into photosynthetically active radiation. Not only to enhance plant yield, but also to control the plant growth ineffective wavelength. In addition to the relevant experiments, test whether the LED lights can reduce greenhouse lighting costs.
Red and blue LED 5: 1 performance of the best red LED to increase plant material
Scientists to hydroponic cultivation of tomatoes as the test object to the three kinds of red and blue LED lights, respectively, according to three kinds of light intensity for 120 days of testing, compared with several other fill light way, including 100% pressure sodium lamp, 100% Light LED lights, high pressure sodium lamp and red LED lights half, and without any fill light and so on.
The results show that the highest yield of five kinds of light, followed by red and blue LED ratio of 5: 1 high light intensity, 5: 1 light intensity, 5: 1 low light intensity, 19: 1 high light intensity, and 100% LED lighting. The use of LED lighting to help plant growth, the effect is better than the high pressure sodium lamp, also said that the greenhouse cultivation improved lighting methods.
On the other hand, the experimental results also show that high light intensity enhances plant growth and fruit yield. 19: 1 ratio can produce the most plant matter, 5: 1 can increase fruit yield. McKill University researchers pointed out that the increase in the number of red LED lamps can proliferate plant material, fruit yield is slightly lower. Therefore, LED plant lights in the strengthening of the greenhouse artificial lighting system, the relevant researchers believe that is a very helpful way.
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