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Evaluation and Enhanced Use of Light Emitting Diodes for Hydroponics

Instrumentation 2019年第3期6卷 18-27页

作者： Jayasanka ranaweera siripala ranaweera Clarence W.DE SILVA Department of Mechanical Engineering The University of British ColumbiaVancouverCanada Department of Botany University of Sri Jayewardenepura NugegodaSri Lanka

Hydroponic farming is a viable and economical farming method,which can produce safe and healthy greens and vegetables conveniently and at a relatively low *** is essential to provide supplemental lighting for crops grown in greenhouses to meet the daily light requirement,Daily Light Integral(DLI).The present paper investigates how effectively and efficiently LEDs can be used as a light source in *** is important for a hydroponic grower to assess the requirement of photo synthetically active radiation(PAR)or the Photosynthetic Photon Flux Density(PPFD),in a greenhouse,and adjust the quality and quantity of supplemental lighting accordingly.A Quantum sensor(or PAR sensor)can measure PAR more accurately than a digital light meter,which measures the light intensity or illuminance in the SI unit Lux,but a PAR sensor is relatively expensive and normally not affordable by an ordinary ***,based on the present investigation and experimental results,a very simple way to convert light intensity measured with a Lux meter into PAR is proposed,using a simple conversion factor(41.75 according to the present work).This allows a small-scale hydroponic farmer to use a simple and inexpensive technique to assess the day to day DLI values of PAR in a greenhouse accurately using just an inexpensive light *** present paper also proposes a more efficient way of using LED light panels in a hydroponic *** moving the LED light panels closer to the crop,LED light source can use a fewer number of LEDs to produce the same required daily light requirement and can increase the efficiency of the power usage to more than 80%.Specifically,the present work has determined that it is important to design more efficient vertically movable LED light panels with capabilities of switching individual LEDs on and off,for the use in *** allows a user to control the number of LEDs that can be lit at a particular time,as *** doing so it is possible to i

关键词： Hydroponics Grow lights Light Emitting Diodes(LEDs) Photosynthesis Photosynthetic Active Radiation(PAR) Photosynthetic Photon Flux Density(PPFD) HPS(High Pressure Sodium) HID(High Intensity Discharge) Daily Light Integral(DLI) Quantum Sensor Digital Light Meter(Lux meter)

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