With the expeditious development of optoelectronics, the light-emitting diode (LED) technology as supplementary light has shown great advancement in protected cultivation. One of the greatest challenges for the LED as alternative light source for greenhouses and closed environments is the diversity of the way experiments are conducted that often makes results difficult to compare. In this review, HortScience aims to give an overview of the impacts of light spectra on plant physiology and on secondary metabolism in relation to greenhouse production.
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