Análise e projeto de iluminação a leds de canais vermelho e azul orientados ao cultivo de lúpulo (Humulus lupulus L.)

Abstract

The plant cultivation supplied partially or totally by artificial radiation source is increasing significantly according to the viability of LED lighting systems. In this context, this work contemplates the relation between plants and radiation in order to consolidate a technical bibliography content, which highlights aspects of photoperiod, electromagnetic spectrum and flux density. The approached studies have provided the development of a luminaire dedicated to attend integrally the radiation required by an adult Hop plant. Moreover, this issue is analyzed by focusing in the spectrum proportion, specific wavelength bands of radiation and flux density quantities defined backwards for healthy development and production of the plant. The hops has been chosen as research object due to its high economy importance in the brewery industry and its restrictions on being cultivated successfully mostly in temperate zones, which justifies studies on climatic adaptations where conditions are not favorable for the plant growth. The luminaire prototyped in this work targets studies on RET (radio-electro-thermal) model and flux density prediction incident on canopy surfaces. The RET validation has shown the model feasibility since the average error presented of 7.8% is reasonable low and facilitates the luminaire controllability by an indirect flux prediction method, through only electrical parameters (average voltage and current of each channel). The flux density prediction in the Phytometric system also presents viability for applications in lighting design while considering plant cultivation chambers. In this case, an acceptable average error of 4.3% has been found for the analyzed scenario, with no need of radiometric measurements that increase cost and complexity of the project.