Friday, 29 July 2011

The Principles of LED Plant Grow Light

LED plant grow light is accorded semiconductor lighting principle, dedicated to flowers & vegetables & other plant production is combined with high precision know-how is of plant growth auxiliary lights. General indoor plant flowers grow over time will be worse & worse, the main reason is the dearth of light irradiation, through the spectrum for needed plant LED lamp, not only can promote its growth, but can also extend the flowering, improve the quality of flowers. Further to the efficient illuminant systems applied to shed, greenhouse facilities etc agricultural production, on the hand, they can solve sunshine leads to such as tomatoes & cucumbers huge awning vegetables taste the disadvantages of decline, on the other hand can also make winter ahead of bio-control know-how on vegetable shed to around the Spring Festival, so as to accomplish anti-season cultivation listed the purpose.

1. Spectral range infect to plant physiology

280 ~ 315nm, physiological processes to form with little effect.

315 ~ 400nm: chlorophyll absorbs less, influence light cycle effect, prevent stem elongation.

400 ~ 520nm (blue): chlorophyll and carotenoids absorb the largest rate, the biggest influence to photosynthesis.

520 ~ 610nm (green): pigment absorption is not high.

610 ~ 720nm (red): chlorophyll absorb the low rate, it had significant influence to photosynthesis processing.

720~ 1000nm: absorption rate is low; stimulate cellular extended, influencing flowering and seed germination.

> 1000nm: converted into heat.

2. From the above data to see, a different wavelength of light for the influence of plant photosynthesis is different, plant photosynthesis need light, in the 400 ~ 720nm wavelength. 400 ~ 520nm (blue) and 610~ 720nm (red) is the largest contribution for photosynthesis. 520 ~ 610nm (green) light absorbed rate is very low by plant pigments.

3. White LED lamp, the most common is to use bule core, stimulate yellow phosphor, which produces visual white light effect. For energy distribution, 445nm blue area and 550nm yellowish area exist two peaks. And for plant needed 610 ~ 720nm is lacking. This explains why the white LED illuminate had disadvantage for plant growth.

4. In accordance with the above principle, PGL are basically made by red and blue color, full blue and full red colors combination all three forms, to provide red and blue two wavelength of light needed, covering all the wavelength range of photosynthesis. In the visual effect, red blue combination plant light looks like pink color.
5. Using the PGL to supply the light, the height of the general distance is 0.5 ~ 1 meter from the blade.
6. PGL red blue chromatographic proportion between 5:1 to 10:1 is appropriate in commonly, usually can choose 7 ~ 8:1 this ratio. Of course if had the conditional, can be adjusted according to the plant growth period the proportion of red and blue light is best.

1 comment:

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