Effects of Red and Blue Light Emitting Diodes (LEDs) on the Growth and Development of Lettuce (var. Youmaicai)

Tang, Yongkang; Guo, Sen; Ai, Weidang; Qin, Lifeng

doi:10.4271/2009-01-2565

Cited by 14 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…blue light with wavelength peak of 435 nm to red light with a wavelength peak 663 nm and at a low intensity of LED light can alter the assimilation translocation between lettuce plant organs. A similar tendency was found in lettuce when the ratio of blue to red increased by 20-50% [17].…”

Section: Discussionsupporting

confidence: 79%

“…Recently, Naznin et al [15] reported that lettuce grown solely under Red LEDs had significantly reduced biomass, chlorophyll content, carotenoid content, and antioxidant levels. Moreover, it has been observed that the lettuce plants could not perform normally in Red light only, and the combination of 90% Red and 10% Blue was considered more effective [17]. Photosynthesis rate, stomatal density, growth, and mineral element content under a combination of Red and Blue appears to be dependent on the Red light/Blue light ratio (R/B ratio and all these parameters increased with a decrease in R/B ratio) [14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Impact of Light Spectrum and Intensity on the Growth, Physiology, and Antioxidant Activity of Lettuce (Lactuca sativa L.)

Mohamed

Rihan

Aljafer

et al. 2021

Plants

View full text Add to dashboard Cite

This study focused on the physiology, growth and antioxidant activity response of hydroponically grown lettuce (Lactuca sativa L.) under sole-source LED lighting of differing spectra. Lighting spectra were provided by differing combinations of LEDs of three different peak wavelengths, (Blue 435, Blue 450, and Red 663 nm) with ratios of B450/R663: 1.25 ± 0.1, B450/R663: 1.25 ± 0.1, and B450/R663 1:1 at two light intensities of photosynthetically active radiation (PAR) (270 μmol m−2 s−1 and 60 μmol m−2 s−1). A further experiment was conducted, in which Blue and Red LEDs were supplemented with Green (Blue 450, Red 663, and Green 520 nm) with ratios of B435/R663: 1.25 ± 0.1, B450/R663/G520: 1/0.73/0.26, and B450/R663: 1.25 ± 0.1. LED light intensities under the different spectra were adjusted to deliver the same level of PAR (270 ± 20 μmol m−2 s−1). Results from the first experiment showed that increased fraction of blue 435 nm in combination with red light at 663 nm at high irradiance enhanced the physiology of lettuce (i.e., significantly increased assimilation rate, stomatal conductance and transpiration rate) and increased the yield while having no significant effect on antioxidant activity. At the lower irradiance, the B435/R663 significantly increased antioxidant activity compared to other spectra. Results from the second experiment showed no significant effect of the spectra of LEDs on the physiology and yield of lettuce, but antioxidant activity was very significantly induced by B450/R663 at the ratio of 1.25 ± 0.1. However, the amount was still less than that obtained by B435/R663 1.25 ± 0.1 from the first experiment. This study indicates that LED light with a spectrum of B435/R663 at a ratio of 1.25 ± 0.1 significantly improves lettuce yield and antioxidant activity.

show abstract

Section: Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

The Impact of Light Spectrum and Intensity on the Growth, Physiology, and Antioxidant Activity of Lettuce (Lactuca sativa L.)

Mohamed

Rihan

Aljafer

et al. 2021

Plants

View full text Add to dashboard Cite

show abstract

“…Besides, if there is a breakthrough in the growth and the quantity of the main vegetable locally, there may be less famine. Therefore, there are two other researches on Chinese cabbage and lettuce, and the best light quality is when the R/B ratios are 7:1 and 9:1 respectively [12][13]. There is no mention about the wavelength, because there is no completely data about photosynthetic spectra of every plant.…”

Section: Introductionmentioning

confidence: 97%

High energy-efficient B+R LED beam shaping with micro-lens diffuser for agricultural lighting

2011

View full text Add to dashboard Cite

An energy saving LED luminaire for agricultural lighting is presented in this paper. To improve the traditional agricultural lightings, the beam shaping technology is required. The LED luminaire is composed of three parts, LEDs, collimator, and micro-lens diffuser. In this paper, the advantages of the LED luminaire are obvious, including uniform and energy saving. With a comparison for traditional agricultural lightings, the LED luminaire can save 63 % in energy consumption.

show abstract

“…One super-bright LED alone cannot provide adequate light for the normal growth of greenhouse plants, but multiple LEDs can meet the fill lighting demand of plants through modular configuration design [6][7][8][9]. Traditional supplemental lighting generally keep definite light intensity and quality [10][11][12] and the light exposure to plants change with the change of ambient light, which cannot meet different demands of different plants or the same plant in different growth stages for PPFD and light quality ratio [1,13,14].Meanwhile, it wastes energies and increases costs. The adaptive LED supplemental lighting system in this paper designs LED light source modules of red, green and blue bands with uniform distribution of irradiance, conducts real-time monitoring and sets ambient light intensity, temperature and humidity through upper computer.…”

Section: Introductionmentioning

confidence: 99%

Design of Adaptive LED Supplemental Lighting System Based on LabVIEW

Niu¹,

Li²,

Tian³

et al. 2016

IJHIT

View full text Add to dashboard Cite

With the global increase in energy prices and the urgent need to reduce CO 2 emissions to the atmosphere, high energy usage is the main problem the greenhouse industry facing. Optimized control of supplemental lighting intensity and quality help to improve productivity and energy efficiency of greenhouse.In this paper,LED light source module is developed according to the design of light distribution of RRGB chip based on plants need for uniform lighting. Adaptive LED supplementary lighting system realize collection, storage and call of environmental data, and adaptive regulation of red, green, and blue light output based on combination of upper computer LabVIEW and controller STM32.PC based on LabVIEW monitor environmental parameters,and call or choose PPFD setting value of red, green, blue three bands of light based on expert database. The controller communicating with LabVIEW wirelessly through WiFi module, conducts real-time detection and adaptive regulation on photosynthetic photon flux density (PPFD) of red, green and blue bands according to PPFD setting value. This intelligent supplemental lighting system meets the requirement of plants for lighting environment and greatly saving energies through adaptive adjustment of PPFD of red, green and blue bands in environment according to the setting based on different supplemental lighting demands of different plants or the same plant in different growth stages for PPFD and light quality ratio.

show abstract

Effects of Red and Blue Light Emitting Diodes (LEDs) on the Growth and Development of Lettuce (var. Youmaicai)

Cited by 14 publications

References 7 publications

The Impact of Light Spectrum and Intensity on the Growth, Physiology, and Antioxidant Activity of Lettuce (Lactuca sativa L.)

The Impact of Light Spectrum and Intensity on the Growth, Physiology, and Antioxidant Activity of Lettuce (Lactuca sativa L.)

High energy-efficient B+R LED beam shaping with micro-lens diffuser for agricultural lighting

Design of Adaptive LED Supplemental Lighting System Based on LabVIEW

Contact Info

Product

Resources

About