![]() ![]() This has led to some undesirable outcomes, such as uneven light quality/quantity over plant surfaces and low light outputs in wavelengths of interest. Although the lighting environment can be manipulated using different colored LEDs, this method only allows for combinations of existing LED colors. AMBERLIGHT EXPERIMENTAL FULLFurthermore, users have limited control over existing LED light conditions (peak wavelength, spectral composition, and full width at half maximum ) under normal operations. For instance, there are only 10–15 LED nominal wavelength options available in the red wavelength range from Cree and Philips Lumileds. However, diode manufacturers offer limited options in terms of wavelength selection. LED wavelengths can be selected to target specific plant physiobiological responses. When compared to HPS lamps and other conventional lighting sources, LEDs are advantageous because specific wavelengths may be selected and controlled. Grand Rapids), was observed when grown under high proportions of amber light. Specifically, suppressed growth of some greenhouse crops, including basil ( Ocimum basilicum) and lettuce ( Lactuca sativa, cv. ![]() In addition, conflicting results were reported on the effect of amber light using HPS lamps. According to some of the same reports, plant productivity and physiology showed either no significant differences or were superior when grown under HPS lamps alone. LEDs have emerged as the prominent plant lighting system over HPS, mainly because of their higher energy efficiency. ![]() Experiments that compare HPS lamps to blue/red LEDs for plant growth and yield are a major focus of plant lighting studies. Findings indicate that amber light is superior to red light for promoting photosynthetic activity and plant productivity, and this could set precedence for future work aimed at maximizing plant productivity in controlled environment agriculture.Īmber-biased (~590–610 nm) high pressure sodium (HPS) lamps were the preferred choice over LEDs in commercial greenhouse facilities until recently, as plant productivity varies with respect to crop choice and growth stages when grown under LED light. This report presents a new and feasible approach to plant photobiology studies, by removing certain wavelengths to assess and investigate wavelength effect on plant growth and photosynthesis. When 630-nm light is blocked, lettuce displayed expanded plant structures and the absence of purple pigmentation. Shifting LED wavelengths from 595 nm to 633 nm and from 595 nm to 613 nm resulted in a biomass yield decrease of ~50% and ~80%, respectively. Four different light spectra were outfitted from existing LEDs using shortpass and notch filters: a double peak spectrum (595 and 655 nm referred to as 595 + 655-nm light) that excluded 630-nm light, 595-nm, 613-nm, and 633-nm light emitting at an irradiance level of 50 W On this basis, we investigated how lettuce plant growth and photosynthetic activity were influenced by broad and narrow light spectra in the 590–630 nm range, by creating amber and red light-emitting diode (LED) spectra that are not commercially available. Red and blue light are the principal wavelengths responsible for driving photosynthetic activity, yet amber light (595 nm) has the highest quantum efficiency and amber-rich high pressure sodium lamps result in superior or comparable plant performance. ![]()
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