scholarly journals A computer-aided stand for testing the power of modern light sources

2018 ◽  
Vol 19 (12) ◽  
pp. 724-728
Author(s):  
Zbigniew Wołczyński ◽  
Karol Pakosz ◽  
Paweł Stachyra
Keyword(s):  
Computer Technology ◽  
Alternating Current ◽  
Light Sources ◽  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps ◽  
Passive Power ◽  
Computer Aided ◽  
Method Of Measurement

The article discusses the method of measuring the power of modern light sources such as compact fluorescent lamps and lamps based on LED diodes. Receivers supplied with alternating current (sinusoidially variable) draw apparent power from the network. It consists of active and passive power. Modern light sources draw electricity from the grid with a course significantly different from the network voltage. Therefore, it is impossible to accurately measure power in a traditional way. The method of measurement presented in the article uses computer technology which allows for accurate measurement of the receiver's power at any voltage and current course of the receiver.

Super LED Lamps and Compact Fluorescent Lamps in the Management of Neonatal Jaundice

2018 ◽  
Vol 20 (2) ◽  
Author(s):  
Patricia O Onianwa ◽  
Iyanuoluwa Oreofe Adubi ◽  
Temitope O Alonge ◽  
Abiodun Jesse Otegbayo ◽  
Olaoluwa S Yaya ◽  
...  
Keyword(s):  
Neonatal Jaundice ◽  
Serum Bilirubin ◽  
Total Serum Bilirubin ◽  
Total Serum ◽  
Light Sources ◽  
Male And Female ◽  
Led Phototherapy ◽  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps ◽  
Significant Difference

Neonatal jaundice is a colossal issue worldwide, particularly in developing countries. About 60 per cent of term and 80 per cent of preterm babies develop jaundice during the first week of life. Approximately 5–10 per cent of all newborns need phototherapy to prevent this commonest morbidity in neonatal life. The commonly used light sources are special blue fluorescent tubes, compact fluorescent tubes and halogen spotlights. In recent years, a new type of light source, light-emitting diodes (LEDs), has been incorporated into phototherapy. It assessed the significant difference between the baseline total and the level of bilirubin for the first four days of using compact fluorescent lamps (CFLs) and super LED phototherapy lamps. It also examined the significant difference in the responses of male and female neonates to the two intervention methods as well as the significant difference in the median weights of neonates on the day of discharge based on the two intervention methods. The count of the baseline total serum bilirubin when using LED lamps was 11.71 and 8.86 when using CFL lamps. The total serum bilirubin count when using LED lamps decreased from 11.12 to 5.30, and from 9.11 to 6.32 when using CFLs. However, there was no significant difference in the responses of male and female neonates to the two intervention methods and the median weights of neonates on the day of discharge.

scholarly journals Comparative Study of Light Sources for Household

2017 ◽  
Vol 25 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Andrzej Pawlak ◽  
Małgorzata Zalesińska
Keyword(s):  
Comparative Study ◽  
Small Degree ◽  
Light Sources ◽  
Test Results ◽  
Light Bulb ◽  
Operational Parameters ◽  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps ◽  
Halogen Light ◽  
Electric Parameters

Abstract The article describes test results that provided the ground to define and evaluate basic photometric, colorimetric and electric parameters of selected, widely available light sources, which are equivalent to a traditional incandescent 60-Watt light bulb. Overall, one halogen light bulb, three compact fluorescent lamps and eleven LED light sources were tested. In general, it was concluded that in most cases (branded products, in particular) the measured and calculated parameters differ from the values declared by manufacturers only to a small degree. LED sources prove to be the most beneficial substitute for traditional light bulbs, considering both their operational parameters and their price, which is comparable with the price of compact fluorescent lamps or, in some instances, even lower.

Methodology for Measurement of the Blue Light Hazard of Light-Emitting Diodes with Imaging Luminance Meter

2013 ◽  
Vol 455 ◽  
pp. 460-465
Author(s):  
Jie Liu ◽  
Xiao Bo Zhuang ◽  
Hua Yao ◽  
Shan Duan Zhang
Keyword(s):  
Blue Light ◽  
Power Distribution ◽  
Spectral Power ◽  
Color Temperature ◽  
Light Sources ◽  
Weighted Function ◽  
Light Emitting ◽  
Spectral Power Distribution ◽  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps

Most of the measurement methods for blue light hazard (BLH) evaluation are based on radiance, which are too complex and hard to find out the highest radiance. We proposed a methodology for measurement of BLH with imaging luminance meter. We measured the relative spectral power distribution with a spectrometer and the maximum luminance with an imaging luminance meter for LEDs and compact fluorescent lamps, and calculated the BLH weighted radiance. The BLH efficacy and the upper limit of luminance with blue light safe of various light sources were also calculated on the basis of the BLH weighted function. The results show absolute blue light safe can be obtained if the luminance is limited to 100 kcd m2 for color temperature lower than 6500 K. LEDs with high color temperature, especially those without diffused window, have potential risk of BLH. Our method can be used in online measurement of the BLH of LEDs.

Formulation of Colors Using a Genetic Algorithm

2012 ◽  
Vol 17 (4) ◽  
pp. 241-244
Author(s):  
Cezary Draus ◽  
Grzegorz Nowak ◽  
Maciej Nowak ◽  
Marcin Tokarski
Keyword(s):  
Genetic Algorithm ◽  
Genetic Algorithms ◽  
Production Process ◽  
Computer Technology ◽  
Manual Method ◽  
Apply Genetic ◽  
Computer Aided ◽  
Multiple Samples ◽  
Plastics Industry

Abstract The possibility to obtain a desired color of the product and to ensure its repeatability in the production process is highly desired in many industries such as printing, automobile, dyeing, textile, cosmetics or plastics industry. So far, most companies have traditionally used the "manual" method, relying on intuition and experience of a colorist. However, the manual preparation of multiple samples and their correction can be very time consuming and expensive. The computer technology has allowed the development of software to support the process of matching colors. Nowadays, formulation of colors is done with appropriate equipment (colorimeters, spectrophotometers, computers) and dedicated software. Computer-aided formulation is much faster and cheaper than manual formulation, because fewer corrective iterations have to be carried out, to achieve the desired result. Moreover, the colors are analyzed with regard to the metamerism, and the best recipe can be chosen, according to the specific criteria (price, quantity, availability). Optimaization problem of color formulation can be solved in many diferent ways. Authors decided to apply genetic algorithms in this domain.

Reductions in electricity consumption and power demand in case of the mass use of compact fluorescent lamps

Energy ◽  
2009 ◽  
Vol 34 (9) ◽  
pp. 1355-1363 ◽  
Author(s):  
J. Trifunovic ◽  
J. Mikulovic ◽  
Z. Djurisic ◽  
M. Djuric ◽  
M. Kostic
Keyword(s):  
Electricity Consumption ◽  
Power Demand ◽  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps

scholarly journals Analytical and experimental discussion of a circuit-based model for compact fluorescent lamps in a 60Hz power grid

2015 ◽  
Vol 35 (1Sup) ◽  
pp. 89-97 ◽  
Author(s):  
Gabriel Alexis Malagon ◽  
Jeisson Bello Peña ◽  
Gabriel Ordóñez Plata ◽  
Cesar Duarte Gualdrón
Keyword(s):  
Scientific Literature ◽  
Power Grid ◽  
Research Work ◽  
Power Grids ◽  
Voltage Source ◽  
Electrical System ◽  
Font Size ◽  
Stroke Width ◽  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps

<p class="MsoNormal" style="text-align: justify;"><span style="font-family: 'Century Gothic', sans-serif; font-size: 8pt; letter-spacing: -0.1pt;"><span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">This article presents an analysis and discussion on the performance of a circuit-based model for Compact Fluorescent Lamps (CFL) <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">in a 120V 60Hz power grid. This model is proposed and validated in previous scientific literature for CFLs in 230V 50Hz systems. <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">Nevertheless, the derivation of this model is not straightforward to follow and its performance in 120V 60Hz systems is a matter of <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">research work. In this paper, the analytical derivation of this CFL model is presented in detail and its performance is discussed when <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">predicting the current of a CFL designed to operate in a 120V 60Hz electrical system. The derived model is separately implemented <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">in both MATLAB<span style="font-family: OptimaLTStd; font-size: 5pt; color: #231f20; font-style: normal; font-variant: normal;">® <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">and ATP-EMTP<span style="font-family: OptimaLTStd; font-size: 5pt; color: #231f20; font-style: normal; font-variant: normal;">® <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">software using two different sets of parameters previously proposed for 230V 50Hz CFLs. These <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">simulation results are compared against laboratory measurements using a programmable AC voltage source. The measurements <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">and simulations considered seven CFLs 110/127V 60Hz with different power ratings supplied by a sinusoidal (not distorted) voltage <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">source. The simulations under these conditions do not properly predict the current measurements and therefore the set of parameters <span style="font-family: OptimaLTStd; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;">and/or the model itself need to be adjusted for 120V 60Hz power grids.</span></span></span></span></span></span></span></span></span><br style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" /></span></span></span></span></span></span></p>

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