Effects of Different LED Light Recipes and NPK Fertilizers on Basil Cultivation for Automated and Integrated Horticulture Methods

This study aims to optimize the conditions for “Genovese” basil (Ocimum Basilicum) germination and growth in an indoor environment suitable for horticulture through a synergic effect of light and fertilizers addition. In fact, several studies determined that specific light conditions are capable of enhancing basil growth, but this effect is highly dependent on the environmental conditions. In this study, the effect of different light sources was determined employing a soil with a negligible amount of fertilizer, demonstrating substantial improvement when light-emitting diode (LED) lights (hyper red and deep blue in different combinations) were applied with respect to daylight (Plants height: +30%, Total fresh mass: +50%). Thereafter, a design of experiment approach has been implemented to calculate the specific combination of LED lights and fertilizer useful to optimize the basil growth. A controlled-release fertilizer based on nitrogen, phosphorus, and potassium (NPK) derived from agro-residues was compared with a soil enriched in macronutrients. The results demonstrate significant improvements for the growth parameters with the employment of the controlled-release NPK with respect to enriched soil combined with a ratio of hyper red and deep blue LED light equal to 1:3 (Total fresh mass: +100%, Leaves number: +20%).

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Analysis on High-Power Seaport LED Luminaire with Uniform Light Distribution Based on Optimized Lens and Heatsink

Applied Sciences ◽

10.3390/app11094035 ◽

2021 ◽

Vol 11 (9) ◽

pp. 4035

Author(s):

Jinsheon Kim ◽

Jeungmo Kang ◽

Woojin Jang

Keyword(s):

Light Source ◽

High Power ◽

Heat Dissipation ◽

Light Emitting Diode ◽

Light Distribution ◽

Light Sources ◽

Led Light ◽

High Power Led ◽

Distribution Requirement ◽

Lighting Application

In the case of light-emitting diode (LED) seaport luminaires, they should be designed in consideration of glare, average illuminance, and overall uniformity. Although it is possible to implement light distribution through auxiliary devices such as reflectors, it means increasing the weight and size of the luminaire, which reduces the feasibility. Considering the special environment of seaport luminaires, which are installed at a height of 30 m or more, it is necessary to reduce the weight of the device, facilitate replacement, and secure a light source with a long life. In this paper, an optimized lens design was investigated to provide uniform light distribution to meet the requirement in the seaport lighting application. Four types of lens were designed and fabricated to verify the uniform light distribution requirement for the seaport lighting application. Using numerical analysis, we optimized the lens that provides the required minimum overall uniformity for the seaport lighting application. A theoretical analysis for the heatsink structure and shape were conducted to reduce the heat from the high-power LED light sources up to 250 W. As a result of these analyses on the heat dissipation characteristics of the high-power LED light source used in the LED seaport luminaire, the heatsink with hexagonal-shape fins shows the best heat dissipation effect. Finally, a prototype LED seaport luminaire with an optimized lens and heat sink was fabricated and tested in a real seaport environment. The light distribution characteristics of this prototype LED seaport luminaire were compared with a commercial high-pressure sodium luminaire and metal halide luminaire.

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Phototactic Response of the Oriental Armyworm, Mythimna separata (Lepidoptera: Noctuidae), to Light-Emitting Diode Lights of Different Wavelengths

10.20944/preprints201905.0014.v1 ◽

2019 ◽

Author(s):

Kil-Nam Kim ◽

Hye-Sung Song ◽

Ryong-Jin Choe ◽

Zhi-Juan Huang ◽

Qiu-Ying Huang ◽

...

Keyword(s):

Light Emitting Diode ◽

Insect Pest ◽

Light Trap ◽

Mythimna Separata ◽

Light Emitting ◽

Led Light ◽

Phototactic Response ◽

Green Led ◽

Oriental Armyworm ◽

Led Lights

Recently, light traps using light-emitting diode (LED) lights have been applied to monitor or control insect pests. The oriental armyworm, Mythimna separata Walker, is an important insect pest that has caused damage to several cereal crops, including corn, wheat and rice. The present study aims to seek out a sensitive wavelength causing high phototactic response in M. separata. The study evaluated the phototactic responses of M. separata moths to several LED lights of different wavelengths and luminance intensities under laboratory condition. Results showed that green (520 nm) LED light resulted in significant phototactic response of M. separata moths compared to LED lights of other wavelengths. Additionally, the highest attraction rate of the moths to green LED light appeared in luminance intensity group of 200 lux compared to the other intensities groups. Experiments under optimum conditions based on the above experiments revealed that the green LED light exhibited the strongest attraction rate (64.44%) among all experimental groups. An experiment performed in a net cage also showed that green LED light resulted in the highest phototactic response of M. separata moths, 1.7 times more than a commercial black light used as control. These findings clearly demonstrate that M. separata moths have a high sensitivity to the green LED light. Therefore, a light trap equipped with green LED light could be useful for monitoring and controlling M. separata moths.

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The influence of lighting spectral composition on physiological response of potato in vitro

The Agrarian Scientific Journal ◽

10.28983/asj.y2021i4pp8-11 ◽

2021 ◽

pp. 8-11

Author(s):

Alexandra Mikhailovna Varushkina ◽

Azalia Ildarovna Yakhina ◽

Alisa Sergeevna Shirinkina ◽

Lybov Gennadevna Tsoma ◽

Anna Leonidovna Latypova

Keyword(s):

Physiological Response ◽

Growth Parameters ◽

Light Emitting Diode ◽

Spectral Composition ◽

Specific Response ◽

Light Sources ◽

Time Data ◽

Potato Varieties ◽

Potato Plants

The microclonal (in vitro) propagation of the original potato plants is important stage in the cultivation of high-quality seed potato. The appropriate microclimate parameters (illumination, temperature, air humidity) are to be maintained in phytotrons for optimal clones’ growth. It is necessary to consider the specific response of potato varieties and, according to it, carefully select the lighting spectral composition. The purpose of the work was to study the effect of various light sources on the morphological parameters of 22 varieties of potato microplants. 10 clones of every variety were selected for the experiment after the initial multi-varietal analysis. After 27 days of cultivation, growth parameters were measured: root length, plant height and the number of internodes. The light sources were light-emitting diode (LED) irradiators ECOLED-BIO-195W-D120 FMatrix IP66, ECOLED-BIO-112-185W-D120 UniversalLED, and 3-ECOLED-60-LX Fito IP65 (“SET” ltd). For the first time, data on the lighting effect on a large sample of potato varieties were obtained, demonstrating significant differences in the physiological response of plants to lighting conditions. According to the research results, it was shown that ECOLED-60-LX Fito IP65 was the optimal source of photosynthetically active radiation for plants among the studied LED-lamps, providing a positive effect on the growth parameters of potato plants, including plants height, length of roots and internodes amount.

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Investigation on optical integration between LED Mid-IR light sources and Si-based waveguides for sensing applications

Journal of Physics Conference Series ◽

10.1088/1742-6596/2145/1/012056 ◽

2021 ◽

Vol 2145 (1) ◽

pp. 012056

Author(s):

Pawaphat Jaturaphagorn ◽

Papichaya Chaisakul ◽

Nattaporn Chattham ◽

Pichet Limsuwan

Keyword(s):

Integrated Circuits ◽

Light Source ◽

Light Emitting Diode ◽

Coupling Scheme ◽

Light Sources ◽

Optical Coupling ◽

Led Light ◽

Carbon Dioxide Gas ◽

Sensing Applications ◽

Ir Light

Abstract Research on mid-IR silicon-based waveguides has recently received strong interest. Particularly, this paper focuses on one of the critical issues in micron-scale photonic integrated circuits, which is to efficiently couple a mid-IR LED (light emitting diode) light source to an external micron-scale waveguide. The optical coupling scheme is crucial for the exploitation of LED light sources in waveguide-based spectroscopic sensing applications. This paper reports optical coupling scheme between an LED mid-IR light source and a silicon rich silicon nitride (SiN) waveguide that could enable the use of LED-based light sources. Finally, the detection limit of the investigated device for carbon dioxide gas detection is calculated.

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A Practical Method to Design Reflector-Based Light-Emitting Diode Luminaire for General Lighting

Advances in OptoElectronics ◽

10.1155/2018/7138592 ◽

2018 ◽

Vol 2018 ◽

pp. 1-10

Author(s):

Jinren Yan

Keyword(s):

Light Emitting Diode ◽

Spherical Surface ◽

Target Surface ◽

Practical Method ◽

Optical Simulation ◽

Light Sources ◽

Aspheric Surface ◽

Light Emitting ◽

Led Light ◽

Spherical Reflector

A reflector-based light-emitting diode (LED) luminaire structure that can achieve a large cut-off angle for general lighting is presented in this work. The proposed lighting unit mainly consists of a spherical reflector and a primary packaging lens that contains an aspheric surface and a spherical surface. The light rays emitted from the LED light source are well controlled by the spherical reflector and the aspheric surface of the lens for the purpose of obtaining a uniform illumination on the target surface. Both the ideal Lambertian LED and non-Lambertian LED light sources were employed to validate the proposed structure and the performance of the designed lighting units was analyzed by optical simulation. The results show that the light utilization efficiencies and the estimated uniformities are 92.96% and 91.11% for ideal Lambertian LED-based lighting unit and 93.31% and 91.64% for non-Lambertian LED-based lighting unit, respectively. Further analysis shows that the tolerances of horizontal, vertical, and rotational deviation of the both lighting units were about 2.0 mm, 1.0 mm, and 1.0°, respectively.

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Case Study for Replacement of Conventional Lights by Led Lights

Journal of Science and Engineering ◽

10.3126/jsce.v7i0.26789 ◽

2019 ◽

Vol 7 ◽

pp. 44-51

Author(s):

Indu Duwal

Keyword(s):

Energy Saving ◽

Energy Demand ◽

Light Emitting Diode ◽

Light Sources ◽

Demand And Supply ◽

Light Emitting ◽

Return Of Investment ◽

Science Group ◽

Led Lights

With the increment in the gap between the demand and supply of energy, various alternatives for decreasing the demand of energy are major concern for the various stakeholders. In order to decrease the energy demand by lighting various energy efficient lights are available in market. However it is difficult to convince the residents to change conventional artificial light sources, since lighting system is an essential part in the building which ensures the comfort, productivity and safety of the occupants in the buildings. Among the various Light Emitting Diode (LED) lights are termed as one of the most efficient energy saving lights which aims to save almost more than 50 % of energy demand than that of CFL lights with same power of illumination. Hence, this study is carried out to calculate energy saving percentage after replacing the conventional lights like florescent, mercury lights and other forms of conventional lights by LED lights. Additionally the study also was focused to evaluate feasibility of the replacement of lights by LED lights in terms of energy saving and return of investment. The research was carried out in building used by Agrotechnology and Food Science (AFSG) science group of Wageningen University in the Netherlands. The results from the study showed that almost 50% of the energy can be saved after replacement by LED lights with around 5 years for return of investment. However, factors like 1) Number of operating hours, 2) Price of lights, 3) Energy cost, 4) Labour cost for replacement and adjustment and 5) Number of replacement and adjustment per hour are the influential features that effects in the performance of various types of lights

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Which Lighting Option Is the Best for Photography in Rhinoplasty?

Facial Plastic Surgery ◽

10.1055/s-0041-1725939 ◽

2021 ◽

Author(s):

Rodrigo Fernández-Pellón ◽

Meshari Saghir ◽

Ayman Jaber ◽

Fazil Apaydin

Keyword(s):

Light Emitting Diode ◽

Light Sources ◽

Light Emitting ◽

Direct Measurements ◽

Significant Difference ◽

Facial Plastic ◽

The Subject ◽

Led Lights ◽

Nasal Length

AbstractPhotography for preoperative analysis and follow-up is indispensable for the facial plastic surgeon. The use of strobe flash units, light-emitting diode (LED) lamps, and their position related to axis of the patient can affect the nasal contours and nasal measurements. The aim of this study was to compare the rhinoplasty pictures taken under three different lighting settings and two different positioning at 30- and 45-degree angles, and with direct measurements taken by caliper from the subjects. Standardized rhinoplasty pictures from 10 patients were taken in frontal view in a studio. These pictures were taken under three different lighting settings: built-in flash of the camera, two strobe flashes, and two LED continuous lights placed at 30 to 45 degree angles to the patient. All the pictures were uploaded to Rhinobase 2.0. In five subjects, direct measurements were done by using a Vernier caliper and compared with the computer measurements. In this study, when comparing the light sources and the angles without taking single flash into account, no relation was found between strobe lights at 30 and 45 degrees and between LED lights at 30 and 45 degrees regarding tip width, base bony width, dorsum width, interalar width, and nasal length. However, a statistically significant difference was found when the angle was changed from 30 to 45 degrees for tip width, interalar width and nasal length. The use of two LED continuous lights or two strobe lights in a studio setting has given similar results. Changing the angles of the light sources from 30 to 45 degrees affected only the tip width and the interalar width; otherwise the rest of the nasal measurements did not show any significant changes. The pictures taken at 45-degree angles to the subject showed the closest values to the direct measurements done on the patient

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Responses of Favorita Potato Plantlets Cultured in Vitro under Fluorescent and Light-Emitting Diode (LED) Light Sources

American Journal of Potato Research ◽

10.1007/s12230-019-09725-8 ◽

2019 ◽

Vol 96 (4) ◽

pp. 396-402 ◽

Cited By ~ 1

Author(s):

Lili Jiang ◽

Ziquan Wang ◽

Guanghui Jin ◽

Dianqiu Lu ◽

Xuezhan Li

Keyword(s):

Light Emitting Diode ◽

Light Sources ◽

Light Emitting ◽

Led Light ◽

Potato Plantlets

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Effects of White LED Lighting with Specific Shorter Blue and/or Green Wavelength on the Growth and Quality of Two Lettuce Cultivars in a Vertical Farming System

Agronomy ◽

10.3390/agronomy11112111 ◽

2021 ◽

Vol 11 (11) ◽

pp. 2111

Author(s):

Thi Kim Loan Nguyen ◽

Kye Man Cho ◽

Hee Yul Lee ◽

Du Yong Cho ◽

Ga Oun Lee ◽

...

Keyword(s):

Energy Use ◽

Light Emitting Diode ◽

Photon Flux ◽

Photon Flux Density ◽

Light Sources ◽

Romaine Lettuce ◽

Led Light ◽

Positive Effects ◽

Vertical Farming

White (W) light-emitting diode (LED) light has been used as an efficient light source for commercial plant cultivation in vertical farming. This study aimed to examine the effect of W LED light sources on the growth and quality of butterhead and romaine lettuce. Three W LED light sources including normal W light (NWL) which has 450 nm as its pumping wavelength and two specific W lights (SWL1 and SWL2) with shorter blue peak wavelength (437 nm) were used to grow lettuce in comparison to a red (R) and blue (B) LED combination. As a result, SWL1 and SWL2 treatments with the same electrical power or photosynthetic photon flux density (PPFD) resulted in more growth of both lettuce cultivars compared to RB treatment. Some phenolic and flavonol contents were increased in the RB treatment, whereas SWL2 treatment stimulated the accumulation of other phenolic and flavonol compounds. Meanwhile, neither NWL nor SWL1 treatments increased the individual phenolic and flavonol contents in either cultivar (except for some flavonols in romaine lettuce in the SWL1 group). In addition, light and energy use efficiencies were also highest in the SWL1 and SWL2 treatments. These results illustrate the positive effects of specific W LED light on lettuce growth and quality, and suggest that the specific W LED light sources, especially SWL2, could be preferably used in vertical farming.

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Radiometric and Spectrophotometric Analysis of Third Generation Light-Emitting Diode (LED) Light-Curing Units

The Journal of Contemporary Dental Practice ◽

10.5005/jcdp-8-2-43 ◽

2007 ◽

Vol 8 (2) ◽

pp. 43-51 ◽

Cited By ~ 5

Author(s):

Barry M. Owens ◽

Kelbin H. Rodriguez

Keyword(s):

Spectral Distribution ◽

Light Emitting Diode ◽

Spectrophotometric Analysis ◽

Battery Life ◽

Light Sources ◽

Third Generation ◽

Light Emitting ◽

Led Light ◽

Restorative Materials ◽

Light Curing

Abstract Aims Light-emitting diode (LED) polymerization of dental restorative materials has become increasingly popular. However, individual light-curing unit (LCU) functions (intensity and/or wavelength emission) may not conform to manufacturer specifications due to quality control issues. The purpose of this study was to evaluate the quality of irradiance, in terms of power density (intensity) and spectral distribution (peak wavelength), emitted from LED and quartz-tungsten halogen (QTH) LCUs in vitro. The battery expenditure of these LED units was also tested. Methods and Materials The intensity and spectral distribution from four third generation LED (Smartlite PS, Coltolux LED, radii Plus, Diopower) and one QTH (Schein Visible Cure) light sources were measured using six different dental curing light meters (Coltolux, Cure Right, Demetron 100, Demetron LED., Hilux, and Light Meter-200) and a visible-ultraviolet light spectrophotometer (Hitachi Elmer-Perkins). The battery life was also plotted for each light source following a 1500 second duration period. The data obtained from radiometric and spectrophotometric analysis was compared to manufacturer specifications. Results Radiometric evaluation revealed LED light units tested did not satisfy manufacturer claims for minimum intensities. Spectral emissions from the LED light sources did meet manufacturer requirements. No clinically appreciable battery drain was evidenced from testing all re-chargeable LED units. Conclusion Despite limitations LED technology appears to be an effective alternative for curing of lightactivated esthetic restorative materials. Additional advantages associated with LED curing lights include ergonomic handling capabilities, negative heat generation, and minimal maintenance concerns. Citation Owens BM, Rodriguez KH. Radiometric and Spectrophotometric Analysis of Third Generation Light- Emitting Diode (LED) Light-Curing Units. J Contemp Dent Pract 2007 February;(8)2:043-051.

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