Controlling plant growth selectively with artificial light
Besides manufacturing products in the common colors of blue, yellow, green and red, these LEDs are also available in the wavelengths 450 nm (Deep Blue), 660 nm (Hyper Red) and 730 nm (Far Red). The emissions spectra of the horticulture WL-SMDC LEDs correlates optimally with the absorption spectra of plant photosynthesis pigments.
The horticulture LEDs are distinguished by high efficiency and brightness, as well as by outstanding PPF values – the Photosynthetic Photon Flux which determines the energy that plants can draw from LED light. The LEDs have a low thermal resistance, an electrically neutral heat path and also offer convincing advantages through their small package size (3535) and low power loss.
While red and blue light provides plants with the most energy, different wavelengths control other growth processes. This fact is used in plant breeding with a controllable individual “light mix”. For instance, far red light (720-740 nm) in the infrared spectrum influences germination. This wavelength range can shorten the flowering time of plants, and promote elongation growth.
Würth Elektronik eiSos GmbH & Co. KG – www.we-online.com
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