Investigating fish behavioural responses to LED lights in trawls and potential applications for bycatch reduction in the Nephrops-directed fishery

Abstract Light-emitting diodes (LEDs) have been tested in trawl fisheries to reduce the bycatch of unwanted species through behavioural stimulation. Previous studies used LED lights to either highlight escaping routes or increase the contact rate with square-mesh panels. However, phototactic responses (moving towards or away from light sources) to LED lights could also be exploited to separate species during the catching process. We investigated if either positive or negative phototaxis can be used to improve fish vertical separation from Nephrops (Nephrops norvegicus) in the aft section of a horizontally separated trawl codend. The aim was to increase the proportion of fish entering the upper compartment. We conducted two different experiments in front of the separation into compartments, inserting green LED lights in the upper and lower netting panel, respectively. Species vertical separation was analysed and compared in two identical trawls towed in parallel, one equipped with lights and one without. We obtained significant changes in vertical separation, but no clear species-specific phototactic response was identified. Neither of the light positions improved fish separation from Nephrops. However, the potential of LED lights as behavioural stimulators is confirmed, and a more mechanistic understanding of light and fish vision may improve the results of future applications.

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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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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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Using InGaN/GaN Multiple Quantum well Green light-Emitting Diodes as a Promising Replacement of Conventional light Sources

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.e7014.109119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 5205-5209

Keyword(s):

Multiple Quantum Well ◽

Three Dimensional ◽

Green Light ◽

Light Sources ◽

Multiple Quantum ◽

Internal Electric Field ◽

Light Emitting ◽

Green Led ◽

P Type ◽

The Impact

In this particular paper we increase a graded indium composition p type InGaN (p InGaN) conduction level to supplant the p type AlGaN electron blocking level & a p GaN level to update the mild yield intensity of a GaN based green light transmitting diode (LED). The indium structure of the p InGaN coating reduced from 10.4 % to zero % across the development heading. A tale configuration is proposed for n-electrode with openings to be connected in Thin-GaN light-transmitting diodes (LEDs). The impact of the n-electrode with gaps on the thermal and electrical qualities of a Thin-GaN LED chip is researched utilizing a three-dimensional numerical simulation The IQE of green LED is restricted by the deformities and the internal electric field in MQW. Thusly, we talk about the ongoing advancement in improving the IQE of green LED in detail. These techniques can be partitioned into two classes. A portion of these techniques were proposed to upgrade precious stone nature of InGaN/GaN MQW with high. In composition and low thickness of deformities by adjusting the development conditions. Different strategies concentrated on expanding electron−hole wave function cover by dispensing with the polarization impact.

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Assessing bird avoidance of high-contrast lights using a choice test approach: implications for reducing human-induced avian mortality

PeerJ ◽

10.7717/peerj.5404 ◽

2018 ◽

Vol 6 ◽

pp. e5404 ◽

Cited By ~ 8

Author(s):

Benjamin Goller ◽

Bradley F. Blackwell ◽

Travis L. DeVault ◽

Patrice E. Baumhardt ◽

Esteban Fernández-Juricic

Keyword(s):

Light Emitting Diode ◽

Visual Saliency ◽

Choice Test ◽

Visual Perspective ◽

Chromatic Contrast ◽

Light Emitting ◽

Behavioral Assay ◽

Achromatic Contrast ◽

Species Specific ◽

Led Lights

Background Avian collisions with man-made objects and vehicles (e.g., buildings, cars, airplanes, power lines) have increased recently. Lights have been proposed to alert birds and minimize the chances of collisions, but it is challenging to choose lights that are tuned to the avian eye and can also lead to avoidance given the differences between human and avian vision. We propose a choice test to address this problem by first identifying wavelengths of light that would over-stimulate the retina using species-specific perceptual models and by then assessing the avoidance/attraction responses of brown-headed cowbirds to these lights during daytime using a behavioral assay. Methods We used perceptual models to estimate wavelength-specific light emitting diode (LED) lights with high chromatic contrast. The behavioral assay consisted of an arena where the bird moved in a single direction and was forced to make a choice (right/left) using a single-choice design (one side with the light on, the other with the light off) under diurnal light conditions. Results First, we identified lights with high saliency from the cowbird visual perspective: LED lights with peaks at 380 nm (ultraviolet), 470 nm (blue), 525 nm (green), 630 nm (red), and broad-spectrum (white) LED lights. Second, we found that cowbirds significantly avoided LED lights with peaks at 470 and 630 nm, but did not avoid or prefer LED lights with peaks at 380 and 525 nm or white lights. Discussion The two lights avoided had the highest chromatic contrast but relatively lower levels of achromatic contrast. Our approach can optimize limited resources to narrow down wavelengths of light with high visual saliency for a target species leading to avoidance. These lights can be used as candidates for visual deterrents to reduce collisions with man-made objects and vehicles.

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The effect of white and green LED-lights on the catch efficiency of the Barents Sea snow crab (Chionoecetes opilio) pot fishery

PLoS ONE ◽

10.1371/journal.pone.0258272 ◽

2021 ◽

Vol 16 (10) ◽

pp. e0258272

Author(s):

Kristine Cerbule ◽

Bent Herrmann ◽

Eduardo Grimaldo ◽

Leif Grimsmo ◽

Jørgen Vollstad

Keyword(s):

Field Experiments ◽

Barents Sea ◽

Carapace Width ◽

Snow Crab ◽

Chionoecetes Opilio ◽

Light Emitting ◽

Green Led ◽

Minimum Landing Size ◽

White Light Emitting Diodes ◽

Led Lights

In commercial snow crab (Chionoecetes opilio) fishery, the catch efficiency of the conical pots is important for increasing the profitability of the industry. This study evaluated the effect of adding green and white light emitting diodes (LED) on the catch efficiency of commercially used conical pots. The results from the field experiments showed that inserting artificial lights significantly increases the catch efficiency for snow crab over the minimum landing size of 95 mm carapace width of up to 76% when using green LED, and by 52–53% on average when using white LED. This study shows that it is possible to improve the catch efficiency of the snow crab fishery by applying artificial LED lights to the conical snow crab pots, potentially resulting in an important economic benefit to the snow crab fishery.

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Low-Temperature Cathodoluminescence Mapping of Green, Blue, and UV GaInN/GaN LED Dies

MRS Proceedings ◽

10.1557/proc-0955-i15-45 ◽

2006 ◽

Vol 955 ◽

Author(s):

Yong Xia ◽

Theeradetch Detchprohm ◽

Jayantha Senawiratne ◽

Yufeng Li ◽

Wei Zhao ◽

...

Keyword(s):

Low Temperature ◽

Light Emission ◽

Light Sources ◽

Peak Wavelength ◽

Pixel Resolution ◽

Lower Efficiency ◽

Light Emitting ◽

Green Led ◽

Standard Configuration ◽

Signal Image

ABSTRACTGaInN based light emitting diodes (LEDs) play an important role as energy efficient light sources in solid state lighting. A controversial discussion addresses the origin of lateral light emission variations and their correlation with either of the identified defects, e.g., threading dislocations and V-defects. In order to establish any possible correlation of defects and luminescence centers, we analyze three UV, blue and green LED dies by microscopic mapping of spectroscopic cathodoluminescence and secondary electrons at variable low temperature from 7 K to room temperature. Particular effort is being placed on a quantitative analysis of the luminescence signal. Image intensities are not being scaled and offset for highest contrast as otherwise typical for imaging mode. In standard configuration, we analyze image areas of (0.037 mm)2 with pixel resolution of 72 nm. Following regions of strong and weak emission we find that remain bright and dark respectively even at low temperature. Those variations increase with the mean emission wavelength of the LEDs and with temperature. The largest peak wavelength variation associated with the intensity contrast was observed in the green LEDs and amounts to 5 nm. Here the peak wavelength is higher in the dark spots than in the bright ones. This finding corresponds to the general trend when comparing the lower efficiency in longer wavelength green emitters to the blue ones.

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LIGHT EMITTING DIODE (LED) HIJAU DAN PENGARUHNYA TERHADAP PENGURANGAN BYCATCH PENYU PADA PERIKANAN GILLNET DI PERAIRAN PALOH (Green Light Emitting Diode (LED) and its Effect on Sea Turtle Bycatch Reduction of Gillnet Fisheries in Paloh Waters)

Marine Fisheries Journal of Marine Fisheries Technology and Management ◽

10.29244/jmf.8.1.87-99 ◽

2017 ◽

Vol 8 (1) ◽

pp. 87

Author(s):

Ganang Dwi Prasetyo ◽

Ronny Irawan Wahju ◽

Roza Yusfiandayani ◽

Mochammad Riyanto

Keyword(s):

Light Emitting Diode ◽

Green Light ◽

Chelonia Mydas ◽

Sea Turtle ◽

Innovative Technology ◽

Light Emitting ◽

Led Light ◽

Green Led ◽

Marine Megafauna ◽

Led Lights

<div class="WordSection1">ABSTRACTBycatch problem is a global issue and can be a driver of marine megafauna declines in the world, such as sea turtle, where is the animal's status as endangered species. Green Light Emitting Diode (LED) is known as an innovative technology to reduce sea turtle bycatch without reduce target catch effectively. The use of green LED in order to reduce sea turtle bycatch in gillnet fisheries was carried out in Paloh Coast, West Borneo during August to October 2015. Experiment performed a total of 20 settings with gillnet fleets operate two units simultaneously, ie gillnet control (without LED lights) and gillnet experiment (with LED lights). Turtles caught predominantly were in the juvenile phase as 57.14% and the potential location of capture sea turtle bycatch in station 2 (1˚52' - 1˚56' LU and 109˚14' - 109˚18' BT). The results, showed that the green turtle (Chelonia mydas) were caught of 7 turtles, were captured by control gillnet 6 turtles with an CPUE 0.29 ± 0.03 Turtle/E, while by experimental gillnet 1 turtle with an CPUE by 0,04 ± 0,009 Turtle/E. The used of green LED light was significantly reduce sea turtle bycatch of 85% without decreasing target catch.Keywords: CPUE, green LED light, sea turtle bycatchABSTRAKPermasalahan terkait bycatch merupakan isu utama global yang dapat mengancam penurunan populasi megafauna laut seperti penyu yang telah berstatus endangerd species. Lampu LED merupakan inovasi teknologi untuk mengurangi bycatch penyu tanpa mengurangi hasil tangkapan ikan utama secara efektif. Penggunaan lampu Light Emmitting Diode (LED) hijau untuk mengurangi bycatch penyu pada perikanan jaring insang (gillnet) dilakukan di perairan Paloh, Kalimantan Barat selama bulan Agustus hingga Oktober 2015. Uji coba dilakukan dengan menggunakan 2 unit kapal gillnet yang dioperasikan di setiap stasiun pengamatan secara bersamaan dengan jumlah ulangan sebanyak 20 kali, diantaranya gillnet kontrol (tanpa lampu LED) dan gillnet eksperimen (dengan lampu LED). Penyu yang tertangkap cenderung didominasi oleh fase juvenile sebesar 57,14% dan lokasi potensi tertangkapnya bycatch penyu pada stasiun 2 (1˚52' - 1˚56' LU dan 109˚14' - 109˚18' BT). Hasil penelitian menunjukkan bahwa penyu yang tertangkap merupakan penyu hijau (Chelonia mydas) berjumlah 7 ekor, terdiri dari 6 ekor tertangkap pada gillnet kontrol dengan CPUE 0,29 ± 0,03 ekor/E, dan 1 ekor pada gillnet eksperimen dengan CPUE 0,04 ± 0,009 ekor/E. Penggunaan lampu LED hijau memberikan pengaruh secara significant untuk mengurangi bycatch penyu dengan persentase pengurangan sebesar 85% tanpa mengurangi hasil tangkapan ikan utama.Kata kunci: CPUE, lampu LED hijau, bycatch penyu</div>

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Multiple fields manipulation on nitride material structures in ultraviolet light-emitting diodes

Light Science & Applications ◽

10.1038/s41377-021-00563-0 ◽

2021 ◽

Vol 10 (1) ◽

Author(s):

Jinchai Li ◽

Na Gao ◽

Duanjun Cai ◽

Wei Lin ◽

Kai Huang ◽

...

Keyword(s):

Light Emitting Diodes ◽

Virus Transmission ◽

Quantum Structures ◽

Light Sources ◽

Light Emitting ◽

Al Content ◽

Potential Applications ◽

Deep Ultraviolet ◽

High Al Content ◽

Ultraviolet Light Emitting Diodes

AbstractAs demonstrated during the COVID-19 pandemic, advanced deep ultraviolet (DUV) light sources (200–280 nm), such as AlGaN-based light-emitting diodes (LEDs) show excellence in preventing virus transmission, which further reveals their wide applications from biological, environmental, industrial to medical. However, the relatively low external quantum efficiencies (mostly lower than 10%) strongly restrict their wider or even potential applications, which have been known related to the intrinsic properties of high Al-content AlGaN semiconductor materials and especially their quantum structures. Here, we review recent progress in the development of novel concepts and techniques in AlGaN-based LEDs and summarize the multiple physical fields as a toolkit for effectively controlling and tailoring the crucial properties of nitride quantum structures. In addition, we describe the key challenges for further increasing the efficiency of DUV LEDs and provide an outlook for future developments.

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Organic Light Emitting Diodes - Innovative Light Sources

Light & Engineering ◽

10.33383/2018-157 ◽

2019 ◽

pp. 101-107

Author(s):

Sergei A. Stakharny

Keyword(s):

Light Source ◽

Organic Light Emitting Diodes ◽

Organic Leds ◽

Light Sources ◽

High Quality ◽

Light Emitting ◽

Organic Light ◽

Lighting Systems ◽

Physical Principles ◽

Prospects Of Application

This article is a review of the new light source – organic LEDs having prospects of application in general and special lighting systems. The article describes physical principles of operation of organic LEDs, their advantages and principal differences from conventional non-organic LEDs and other light sources. Also the article devoted to contemporary achievements and prospects of development of this field in the spheres of both general and museum lighting as well as other spheres where properties of organic LEDs as high-quality light sources may be extremely useful.

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