Light spectrum for maximum luminous efficacy of radiation and high color quality

2018 ◽  
Author(s):  
Irving R. Ramos-Romero Ramos-Romero ◽  
Ivan Moreno
Keyword(s):  
Light Spectrum ◽  
Luminous Efficacy ◽  
Color Quality

scholarly journals Effect of Red Y2O3:Eu3+ phosphor on the color quality and luminous efficacy of the 7000K IPW-LEDs

2019 ◽  
Vol 17 (5) ◽  
pp. 2512
Author(s):  
Van-Duc Phan ◽  
Minh Tran ◽  
Le Anh Vu ◽  
Hoang-Nam Nguyen ◽  
Tran Thanh Trang
Keyword(s):  
Luminous Efficacy ◽  
Color Quality

scholarly journals Y2O3:Ho3+ and ZnO:Bi3+: a selection for enhancing color quality and luminous flux of WLEDs

2020 ◽  
Vol 10 (5) ◽  
pp. 5162
Author(s):  
Nguyen Thi Phuong Loan ◽  
Nguyen Doan Quoc Anh
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Luminous Flux ◽  
Configuration Model ◽  
Single Chip ◽  
Luminous Efficacy ◽  
Light Emitting ◽  
Color Quality ◽  
Color Rendering ◽  
Research Show

As the luminescence industry develops, the white light light-emitting diode (LED) package with a single chip and a single phosphor although produces good luminous flux but has a poor color rendering index (CRI) can no longer fulfill the requirements of modern lighting applications. Therefore, this research is conducted to response to the urgent demands of improving other lighting qualities of WLED while maintaining high luminous efficiency. To achieve this target, we applied the new WLED package, which contains multi-chips and multi-phosphor layers, and have obtained outstanding results in both CRI and luminous efficacy. Two types of phosphor used in the WLED package are Y2O3:Ho3+ and ZnO:Bi3+. A color configuration model is also developed to adjust the shading of the white-light LED module. The results of this research show that the triple-layer phosphorhas the best performance when applied in a white-light LED package, which is demonstrated through better color quality, CRI and luminous efficacy, The manufacturers can rely on this research to produce the optimal-quality WLED, or WLED that is appropriate to their quality demands.

scholarly journals Excellent Luminous Efficacy and Color Homogeneity of White Light-Emitting Diodes with YPO4:Ce3+:Tb3+ Phosphor

2018 ◽  
Vol 72 ◽  
pp. 02002
Author(s):  
Vo Phu Thoai ◽  
Nguyen Doan Quoc Anh
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
White Led ◽  
Gradual Decline ◽  
Luminous Efficacy ◽  
Light Emitting ◽  
Color Quality ◽  
Quality Scale ◽  
Color Uniformity ◽  
White Light Emitting Diodes

In this paper, we focus on researching the method, which the color homogeneity and the lumen output of multi-chip white LED lamps (MCW-LEDs) need to support for increasing the efficiency. The successful results can be achieved by mixing the green YPO4:Ce3+:Tb3+ phosphor with their phosphor compounding. Through experiment results, we assert that the MCW-LEDs can achieve the significant consequence in performance by following that method and it is also again confirmed that when the concentration of YPO4:Ce3+:Tb3+ has tendency to increase, which impulse the development of the color uniformity and the luminous efficacy of MCW-LEDs with average correlated color temperatures (CCT) of 8500 K, while the color quality scale shows signs of gradual decline. It is not difficult to gain incredible presentation of MCW-LEDs if we are clever in choosing the suitable concentration and size of YPO4:Ce3+:Tb3+.

scholarly journals The color quality of Sumatra barb Puntigrus tetrazona (Bleeker, 1855) in different light spectrum exposure

2020 ◽  
Vol 20 (3) ◽  
pp. 281
Author(s):  
Wijianto Wijianto ◽  
Kukuh Nirmala ◽  
Yuni Puji Hastuti ◽  
Eddy Supriyono
Keyword(s):  
White Light ◽  
Physiological Response ◽  
Red Light ◽  
Green Light ◽  
Quality Analysis ◽  
Light Spectrum ◽  
Color Quality ◽  
Orange Color ◽  
Black Color

The color quality of Sumatra barb that cultivated by the farmers are not as good as the fish that collected from the wild. One of the causes is the unsuitable environment for maintaining and breeding Sumatran barb. This research aims to compare color quality of Sumatra barb Puntigrus tetrazona by exposure the different light spectrums on maintenance media. The experiment was completely randomize design with six treatments and three replications consisted of K (control), R (room light), M (red light spectrum), H (green light spectrum), B (blue light spectrum) and P (white light spectrum). The method used to measure Sumatra barb color quality using Photoshop CS 5 software and chromatophore cell calculations. The results of color quality analysis after 28 showed that the (M) treatment had the highest percentage of color quality was 48.81 ± 1.57% for orange color and 32.26 ± 0.07% for black color. The highest number of chromatophore cells was in M treatment with 147 ± 3.7 cells mm-². The red light spectrum (M) treatment showed the best physiological response and improvement of color quality and the glucose level was 23.00 ± 1.00 mg dL−1. The best color quality of the Sumatra barb is produced by exposure to the red light spectrum (M).

scholarly journals The effectiveness of LED light spectrum exposure on growth and color performance of orange clownfish, Amphiprion percula (Lacèpède, 1802) juvenile

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Ris Dewi Novita ◽  
Kukuh Nirmala ◽  
Eddy Supriyono ◽  
Idil Ardi
Keyword(s):  
Quality Parameters ◽  
Global Market ◽  
Light Spectrum ◽  
Blue Led ◽  
Led Light ◽  
Glucose Levels ◽  
Amphiprion Percula ◽  
Color Quality ◽  
Orange Color

Orange clownfish is one of the most desired marine ornamental fish by global market due to the orange color on it. The obstacles of the clownfish farming is the changes of the orange color on clownfish. Manipulation of the light spectrum exposure may affect the amount of chromatophore, that can change the color of clownfish become brighter. The present study was aimed at determining an appropriate spectrum of LED light toward growth and color quality of Amphiprion percula juvenile farming. The study was conducted in five treatments with three replication. The treatment consists of four types of LED light with different wavelengths i.e., white (P), red (M), green (H) and blue (B) with 12 hours and control. Clownfish with an average body weight of 0.91±0.19 g and length of 3.28±0.24 cm were used in this study. The result after 60 days showed that the blue LED light give the best glucose levels of 40.00±2.65 mg dL-1, malondialdehyde levels of 9.30±0.29 nmol mL-1, specific growth rate of 1.71±0.05% and feed efficiency of 78.23±1.97%. The best color quality parameters on blue LED light treatment with the Toca color finder (TCF) score reach the orange color on the dorsal, caudal and anal, RGB ratio on the color of the dorsal, caudal and anal each of 64.59±1.00%, 68.12±0.74% and 72.56±0.20% as well as the number of chromatophore each of 346±10 cells/ 0.1 mm-2. The spectrum blue LED light was able to result the growth and quality of best color for clownfish Amphiprion percula juvenile.AbstrakIkan badut Amphiprion percula merupakan ikan hias air laut yang diminati pasar global ikan hias karena memiliki daya tarik tersendiri pada warna jingga yang dimilikinya. Ikan badut hasil budi daya memiliki kualitas warna jingga yang cenderung memudar. Penggunaan manipulasi spektrum cahaya dalam sistem budi daya dapat memengaruhi perubahan jumlah kromatofor yang dapat meningkatkan warna ikan menjadi terang. Tujuan penelitian ini adalah menentukan spektrum cahaya lampu LED yang tepat terhadap pertumbuhan dan kualitas warna yuwana ikan badut. Penelitian ini menggunakan Rancangan Acak Lengkap pada lima perlakuan dan tiga ulangan. Perlakuan terdiri atas empat jenis spektrum cahaya lampu LED dengan panjang gelombang berbeda yakni putih (P), merah (M), hijau (H) dan biru (B) dengan lama penyinaran 12 jam dan kontrol. Rerata panjang total awal ikan uji adalah 3,28±0,24 cm dan bobot 0,91±0,19 g. Hasil penelitian selama 60 hari pemeliharaan menunjukkan bahwa parameter respons fisiologis dan pertumbuhan terbaik adalah pada perlakuan lampu LED biru dengan kadar glukosa sebesar 40,00±2,65 mg dL-1, kadar malondialdehyde (MDA) sebesar 9,30±0,29 nmol mL-1, laju pertumbuhan spesifik (LPS) sebesar 1,71±0,05% dan efisiensi pakan (EP) sebesar 78,23±1,97%. Parameter kualitas warna terbaik pada perlakuan lampu LED biru dengan skor dalam Toca color finder (TCF) mencapai warna jingga pada bagian dorsal, caudal dan anal, red,green and blue (RGB) ratio pada warna bagian dorsal, caudal dan anal masing-masing sebesar 64,59±1,00%, 68,12±0,74%, dan 72,56±0,20% serta jumlah kromatofor sebesar 346±10 sel/ 0,1 mm-2. Spektrum cahaya lampu LED biru menghasilkan pertumbuhan dan kualitas warna terbaik pada yuwana ikan badut Amphiprion percula.

Analysis of Characteristics of Halogen and LED Automobile Lamps

2020 ◽  
pp. 57-62
Author(s):  
Olga Yu. Kovalenko ◽  
Yulia A. Zhuravlyova
Keyword(s):  
Power Consumption ◽  
Flip Chip ◽  
Weather Conditions ◽  
Luminous Flux ◽  
Luminous Efficacy ◽  
Colour Temperature ◽  
Study Results ◽  
Calculation Results ◽  
Mandatory Rules ◽  
Halogen Lamps

This work contains analysis of characteristics of automobile lamps by Philips, KOITO, ETI flip chip LEDs, Osram, General Electric (GE), Gtinthebox, OSLAMPledbulbs with H1, H4, H7, H11 caps: luminous flux, luminous efficacy, correlated colour temperature. Characteristics of the studied samples are analysed before the operation of the lamps. The analysis of the calculation results allows us to make a conclusion that the values of correlated colour temperature of halogen lamps are close to the parameters declared by manufacturers. The analysis of the study results has shown that, based on actual values of correlated colour temperature, it is not advisable to use LED lamps in unfavourable weather conditions (such as rain, fog, snow). The results of the study demonstrate that there is a slight dispersion of actual values of luminous flux of halogen lamps by different manufacturers. Maximum variation between values of luminous flux of different lamps does not exceed 14 %. The analysis of the measurement results has shown that actual values of luminous flux of all halogen lamps comply with the mandatory rules specified in the UN/ECE Regulation No. 37 and luminous flux of LED lamps exceeds maximum allowable value by more than 8 %. Luminous efficacy of LED lamps is higher than that of halogen lamps: more than 82 lm/W and lower power consumption. The results of the measurements have shown that power consumption of a LED automobile lamp is lower than that of similar halogen lamps by 3 times and their luminous efficacy is higher by 5 times.

Senior Living - Lighting, Circadian Rhythm and Dementia I

2019 ◽  
pp. 4-8
Author(s):  
Tadej Glažar ◽  
Marjeta Zupancic ◽  
Samo Kralj ◽  
Robert Peternelj
Keyword(s):  
The Elderly ◽  
Living Environment ◽  
Elderly Persons ◽  
Light Spectrum ◽  
Average Life Expectancy ◽  
The Real Estate ◽  
Lighting Conditions ◽  
Light Levels ◽  
Joint Fracture ◽  
Lease Contracts

The Real Estate Fund of Pension and Disability Insurance (Nepremicninski Sklad) in Slovenia, founded in1997 is the owner of 3255 properties in 116 locations throughout the country and is intended for solving housing issues of pensioners of 65 years or older and other elderly persons who are allowed independently to live. The lease contracts are concluded for an indefinite period of time. The aim and vision of the Fund is to improve the quality of life for the elderly tenants by adapting the living environment, the flats and surroundings according to the physical needs of aging tenants. Homes for seniors often have low light levels and poor light spectrum caused by fluorescent or incandescent lighting. Demographic changes in most European countries show rising average life expectancy which means that the number of people with weak visual capacity or visual impairment is increasing. Equally the risks of injuries due to poor lighting conditions are increasing, e.g. missing a step resulting in a hip joint fracture. Better lighting conditions are of critical importance for aging population, as stated also in the recently published CIE227:2017. To facilitate safe environment for the elderly, the Fund in 2013 initiated a lighting research study that should provide facts and evidence for a lighting standard for their own premises.

Influence of Nitrogen and Potassium on Three Zoysiagrasses

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 516b-516
Author(s):  
James N. McCrimmon
Keyword(s):  
Gulf Coast ◽  
Block Design ◽  
Nutrient Content ◽  
Zoysia Japonica ◽  
Tissue Samples ◽  
Color Quality ◽  
Randomized Complete Block Design ◽  
Color Density ◽  
Minimal Research ◽  
Micronutrient Fertilizer

Zoysiagrass has great potential for use in the Gulf Coast states as a turfgrass. There has been minimal research on the nitrogen (N) and potassium (K) fertility response of zoysiagrass and the effect on turf color, quality, and nutrient content. The objective of this study was to evaluate the effects of N and K fertility on zoysiagrass. A study was conducted on three zoysiagrasses: Zoysia japonica × Z. tenuifolia Willd. ex Trin. (`Emerald'); Z. japonica Steud. (`Meyer'); and Z. matrella. The N and K treatment combinations consisted of high (H) and low (L) rates of N and K at the following levels: N levels of 454 and 227 g N/92.9 m2 per month and K levels of 454 and 227 g N/92.9 m2 per month. The treatment combinations were (N and K): HH, HL, LH, and LL and were applied in two split applications monthly from July through November. The study was a randomized complete-block design with three replications. All plots received two applications of a micronutrient fertilizer (late June and August), were irrigated as needed, and maintained at a height of 3.8 cm. Color, density, texture, uniformity, and quality were determined visually for each month. Plant tissue samples were collected (September) and analyzed for macronutrient and micronutrient contents. There were significant differences for color, density, and quality in the following months: September (color and density); October (quality); and November (color and quality). There were differences in leaf texture for all months. There were significant differences for N, magnesium (Mg), and K contents but there were no differences for any micronutrient. This study indicated that all three zoysiagrasses provided acceptable color and quality during the summer and fall, and that N and K rates affected N, K, and Mg contents in the plant.

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