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Philips LED Lighting in horticulture - Philips Lighting

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Constant quality of artificiallighting is very important <strong>to</strong>increase the quality of cropproduction”1Relative eye sensitivity0.80.60.40.20380 430 480 530 580 630 680 730 780Wavelength (nm)Relative pho<strong>to</strong>synthesis efficiency10.80.60.40.20380 430 480 530 580 630 680 730 780Wavelength (nm)The main properties of lightthat make the plant growwell/flower:Light quantity / intensityThe growth of a plant is strongly determined bythe <strong>to</strong>tal number of pho<strong>to</strong>ns that it absorbs in thePAR region. In winter there is often <strong>to</strong>o littlenatural light for plants <strong>to</strong> grow and continue <strong>to</strong>produce good flowers and fruits.Day lengthWith many plants, the time of flowering isinfluenced by the pho<strong>to</strong>period. For example, achrysanthemum plant will only bloom when thenight is long. We call them ‘short day plants’.However when you apply long day light <strong>to</strong> them,the flowering will be surpressed.SpectrumThe mix of colors in the light (spectrum) alsostrongly influences the development of a plant.Light uniformityWhen using artificial lighting, uniformity andconstant quality of the light spectrum is veryimportant for a constant quality of cropproduction.Philips Horticulture LED Solutions - General booklet11

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