Amber light LED narrow wavelength plant growth system

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Light-emitting diodes (LEDs) are slowly becoming the primary lighting source in controlled environments. However, high pressure sodium (HPS) are still preferred by most growers as they result in higher yield and better plant quality for most plants when compared to LEDs. The advantage of LEDs over HPS lamps and other conventional lighting sources is the ability to select specific wavelengths of light, but most manufactures provide red (620 nm to 680 nm) and blue (420 nm to 460 nm) LEDs with limited wavelengths outside of this spectrum with nothing in the amber range where HPS is highest. Optical filters are tools that can be used to control LED wavelength characteristics. The goal of this proposal is to target specific wavelengths of light that impact plant growth and filter the light to 5 nm of precision with an ultimate goal to reach 1 nm and use this light to design light recipes to enhance plant growth. Our project objective is to construct and test a LED narrow wavelength plant growth (LED-NWPG) optical filter system that can be used to select the wavelengths of amber light, mimicking and surpassing the plant growth rate of the HPS lamps through improved biomass, leaf width and photosynthetic rate. This technology has been of interest to multiple end users including LED manufacturers (U Technology), growers (Choice North Farms), and grower groups (Quebec Farmers' Association).******