Simple triac dimmable Compact Fluorescent Lamp ballast and Light Emitting Diode driver

2010 ◽  
Author(s):  
Andre Tjokrorahardjo
Keyword(s):  
Light Emitting Diode ◽  
Fluorescent Lamp ◽  
Light Emitting ◽  
Compact Fluorescent Lamp

scholarly journals Effectiveness of light emitting diode versus conventional phototherapy in neonatal hyperbilirubinemia: a hospital based observational study

2020 ◽  
Vol 8 (3) ◽  
pp. 1051
Author(s):  
Radheshyam Purkait ◽  
Manik Mondal
Keyword(s):  
Side Effects ◽  
Light Emitting Diode ◽  
Total Duration ◽  
Conventional Group ◽  
Light Sources ◽  
Fluorescent Lamp ◽  
Light Emitting ◽  
Led Phototherapy ◽  
Significant Difference ◽  
Compact Fluorescent Lamp

Background: The most commonly used light sources in the conventional phototherapy units are compact fluorescent lamp (CFL), halogen spotlights and fiberoptic blankets. Recently light emitting diodes (LED) has emerged as better light source for phototherapy and almost replacing all the available conventional light sources. Comparative studies on the efficacy of LED versus conventional phototherapy are limited from India. That is why; this study was undertaken.Methods: 48 neonates of ≥35 weeks gestational age with hyperbilirubinemia were participated in this study. Among them, 24 neonates received conventional phototherapy and rest of them received LED phototherapy. The rate of fall of bilirubin levels at 6 hours and at completion along with total duration of phototherapy in both groups was measured. Results analysed by standard statistical methods.Results: LED phototherapy units showed higher rate of fall in bilirubin at six hrs (LED group: 0.38±0.05 mg/dl/hr versus conventional group: 0.30±0.04 mg/dl/hr, p<0.05) and after completion of therapy (LED group:                      0.32±0.03 mg/dl/hr versus conventional group: 0.26±0.03 mg/dl/hr, p<0.05) compared to conventional group. Significant difference was documented in total duration of phototherapy in LED group (30.8±1.8 hours) when compared to conventional group (34.6±0.7 hours). None of the neonate showed phototherapy failure. Side effects were minimal and comparable in both the groups.Conclusions: The LED phototherapy units are more efficacious in terms of higher rate of fall of bilirubin levels and lesser duration of phototherapy compared to conventional phototherapy units.

scholarly journals Smart Street Lighting Detecting Vehicle and Pedestrian Movement Aiming for Sustainable Bhutan

2020 ◽  
Vol 9 (3) ◽  
pp. 4276-4281
Keyword(s):  
Light Emitting Diode ◽  
Electrical Energy ◽  
Fluorescent Lamp ◽  
Infrared Source ◽  
Light Emitting ◽  
Underdeveloped Countries ◽  
Global Issue ◽  
High Initial Cost ◽  
Compact Fluorescent Lamp ◽  
And Control

An energy crisis is global issue nowadays. Bhutan however, does not realize it being blessed with good geographical and demographical diversity. It is high time that Bhutan realize the need of energy conservation technique. The electrical energy is wasted unnecessarily which starts from keeping the mobile charger plugged in the socket when not in use to lamps keeping ON in streets throughout day and night. People don’t seem to care but monitoring it for better conservation benefit has become crucial in underdeveloped countries like Bhutan whose source of energy is limited to hydropower only. Wind and solar generations are feasible but the energy cost per unit would be very high due to high initial cost. A case study conducted within the college campus revealed tremendous savings a college can make just by replacing conventional compact fluorescent lamp (CFL) with light emitting diode (LED). Therefore, the best option for Bhutan and Bhutanese people is to take better care of the existing energy sources and use it judiciously. This paper proposes a method to monitor and control the street/compound lighting in a smarter way. The two types of sensors are employed. The light dependent resistor (LDR) is used to monitor the intensity or brightness of surrounding and passive infrared (PIR) sensor is employed for detecting infrared source. The sensor output is processed and monitored by the PIC16F877A microcontroller. Moreover, the incandescent lamp and the compact fluorescent lamp will be replaced by LED lamps. The project aims to reduce power consumption in Bhutan through proposer control of street/compound lighting so as to have better economy of the country by exporting more unit of energy to neighboring country.

scholarly journals Comparison of light emitting diode and compact fluorescent lamp phototherapy in treatment of neonatal hyperbilirubinemia

2017 ◽  
Vol 4 (2) ◽  
pp. 341 ◽  
Author(s):  
Maharoof M.K. ◽  
Shamshad Ahmed Khan ◽  
Prakash Robert Saldanha ◽  
Reshad Mohamed
Keyword(s):  
Gestational Age ◽  
Serum Bilirubin ◽  
Light Emitting Diode ◽  
Neonatal Hyperbilirubinemia ◽  
Total Serum Bilirubin ◽  
Total Serum ◽  
Fluorescent Lamp ◽  
Light Emitting ◽  
The Mean ◽  
Compact Fluorescent Lamp

Background: High levels of total serum bilirubin can cause life threatening complications in neonates requiring management either with phototherapy or exchange blood transfusion. Most commonly used modality of phototherapy is with blue light. There are many bulbs like fluorescent tubes, halogen spotlights etc. Due to disadvantages of the available bulbs, newer method like light-emitting diodes (LEDs) has been investigated as possible alternatives as they produce low heat, has a longer life span with lower energy consumption and rapid reduction of serum bilirubin level. The aim was to compare the efficacy between phototherapy equipped with light emitting diode (LED) to compact fluorescent lamp (CFL) in the treatment of neonatal hyperbilirubinemia among neonates.Methods: A hospital-based intervention study was conducted among 50 neonates born in the hospital during the study period, with gestational age more than equal to 35 weeks, being breastfed and healthy in a private medical college teaching hospital in Dakshina Kannada district from August to September 2016.  Following ethical committee clearance the neonates looking icteric by clinical examination were randomly allocated to receive CFL or LED phototherapy. Baseline, 24 hour total serum bilirubin and rectal temperature was measured.  Results: A total of 50 neonates were randomly allocated into two groups with almost similar characteristics between the two groups with respect to gender, type of delivery and gestational age. The mean bilirubin values (in mg/dl) among neonates in the CFL group and LED group were 14.8 and 15.6 respectively and post 24 hour values were 11.54 and 10.68 respectively. The mean difference in the reduction in the bilirubin values before and after receiving phototherapy between the two groups were significant (p <0.001). The increase in temperature was lesser among LED treatment group.Conclusions: LED therapy is better than the CFL therapy in terms of mean reduction in the total serum bilirubin after a fixed duration of time and lesser raise in temperature among the neonates.  

scholarly journals Proposed Safe Distance between Object & Artificial Light Sources in Historical Building or Museum in Terms of Conservation

2019 ◽  
Vol 9 (1) ◽  
pp. 4047-4052
Keyword(s):  
Light Emitting Diode ◽  
Light Sources ◽  
Main Body ◽  
Fluorescent Lamp ◽  
Historical Building ◽  
Light Emitting ◽  
Heritage Building ◽  
Compact Fluorescent Lamp ◽  
Ultraviolet Ray ◽  
Living Objects

It is well known fact that light is associated with its neighbouring spectrum of Ultraviolet ray (UV ray). UV has deleterious effects upon living and non-living objects. In order to avoid this bad effect of UV some simplified methods to need to try out. Experimentation has been carried out with Incandescent lamp, Conventional Fluorescent lamp, Compact Fluorescent Lamp (CFL) and Light Emitting Diode (LED) lamps and separately UV content as well as illuminance at various distances have been measured. UV-measurement has been made by UV meter made through world reputed make- Konica Minolta, Japan and illuminance is measured by Lux-Meter. The observations have been shown in the main body of the paper which shows successful results as per expectations. The system can be adopted for Museum lighting where important archives can be saved from bad effects of emitted UV from the ambient light sources. This simple methodology can thus be adapted for indoor application in Museum lighting/ Heritage building lighting where archives can be easily conserved.

scholarly journals Analysis of Energy and Cost Performance of Retrofitting Fluorescent Tubes with Compact Fluorescent and Light Emitting Diode Lamps

2020 ◽  
pp. 34-46 ◽  
Author(s):  
J. S. Adeleke ◽  
A. B. Wahab ◽  
E. A. Olanipekun
Keyword(s):  
Light Emitting Diode ◽  
Electricity Consumption ◽  
Poor Performance ◽  
Payback Period ◽  
Optimal Performance ◽  
Light Emitting ◽  
Tertiary Institutions ◽  
Fluorescent Lamps ◽  
Significant Difference ◽  
Compact Fluorescent Lamp

Over the years, visual comfort has been described as a major requirement needed to enhance optimal performance of occupants in any learning environment in tertiary institutions. This is reflected in the poor performance of the commonly used Fluorescent Lamps (FL) occasioned by its constant burn-off, high failure rate and reduced durability. Hence, there is a shift to the adoption of Compact Fluorescent Lamp (CFL) and Light Emitting Diode (LED). This study therefore examined the pattern of electricity consumption involving the adoption of FL, CFL and LED in the purposively selected lecture theatres of Obafemi Awolowo University, Ile-Ife, Nigeria. The study was carried out using energy monitor to obtain the consumption data of the lamps for periodic logging at intervals of 1 hr, 3 hrs, 6 hrs, 12 hrs, 1 day, 7 days, 1 month and 3 months respectively; and also to determine the payback period of each of the lamps. From the data collected, patterns of electricity used, electricity savings were calculated and compared to establish performance potentials of each of the lamps. The study found that there was a significant difference in the pattern of electricity consumption of FLs compared with that of CFLs and LEDs, but a reduced margin existed between CFLs and LED lamps. It showed that the FLs consumed 681.576 kWh, 1619.466 kWh and 5652.432 kWh, CFLs consumed 387.302 kWh, 692.479 kWh and 1936.600 kWh, while LED consumed 294.188 kWh, 426.608 kWh and 1499.015 kWh. There were significant differences in consumption with 43, 47 and 65% reduction in electricity consumption using CFLs while 57, 73 and 73% using LED fittings were obtained. The CFLs performed better in terms of return on investments by having a lower payback period when compared to LED. The study concluded that replacing FL with CFL and LED would be desirable option in order to enhance optimal performance of lecture theatres, but in terms of payback period, it would be beneficial to retrofit FLs with CFLs.

Changes in Lighting Source Can Produce Inaccurate Assessment of Visual Poultry Doneness and Induce Consumers To Eat Undercooked Ground Turkey Patties

2019 ◽  
Vol 82 (3) ◽  
pp. 528-534 ◽  
Author(s):  
CURTIS MAUGHAN ◽  
EDGAR CHAMBERS IV ◽  
SANDRIA GODWIN ◽  
DELORES CHAMBERS
Keyword(s):  
Foodborne Pathogens ◽  
Light Emitting Diode ◽  
The United States ◽  
Extrinsic Factors ◽  
Visual Appearance ◽  
Light Emitting ◽  
End Point ◽  
Lighting Conditions ◽  
Compact Fluorescent Lamp ◽  
End Point Temperature

ABSTRACT Undercooked poultry is a potential source of foodborne pathogens, such as Salmonella and Campylobacter. The best way to avoid eating undercooked poultry is to use a food thermometer during cooking. However, consumers who cook poultry often use visual appearance for determining doneness, which relies on extrinsic factors, including lighting conditions. Because the United States recently mandated changes in lighting to promote energy conservation, this study evaluated the effect of lighting sources on consumer perceptions of doneness and willingness to eat cooked poultry patties. Consumers (n = 104) evaluated validated photographs of turkey patties cooked to different end point temperatures (57 to 79°C) and rated the level of perceived doneness and willingness to eat each sample. Evaluations were conducted under different lighting sources: incandescent (60 W, soft white), halogen (43 W, soft white), compact fluorescent lamp (13 W, soft white), light-emitting diode (LED; 10.5 W, soft white), and daylight LED (14 W). Lighting changed perception of doneness and willingness to eat the patties, with some of the energy-efficient options, such as LED and halogen making samples appear more done than they actually were, increasing the willingness to eat undercooked samples. This poses a risk of consuming meat that could contain bacteria not killed by heat treatment. Recent changes in lighting regulations can affect lighting in homes that affects perceptions of poultry doneness, requiring that educators place extra emphasis on the message that properly using a meat thermometer is the only way to ensure meat is cooked to a safe end point temperature.

DESIGN AND IMPLEMENTATION OF A PID-BASED LUMINANCE CONTROL AND LIGHT SENSING USING SMOOTHING AVERAGING TECHNIQUE

2016 ◽  
Vol 78 (6-3) ◽  
Author(s):  
Editha Macorol ◽  
Favis Joseph Balinado ◽  
Leo M. Flores ◽  
Ezekiel V. Pascual ◽  
Christian M. Silva ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Luminance Level ◽  
Light Sources ◽  
Averaging Technique ◽  
Light Emitting ◽  
Incandescent Light ◽  
Light Sensing ◽  
Light Stimuli ◽  
Compact Fluorescent Lamp ◽  
Global Energy Consumption

Nowadays, lighting shares a large part in the global energy consumption, lighting consumption can be easily reduced with the use of efficient light sources. The most commonly used light source is the incandescent light bulb. As time passed by, Compact Fluorescent Lamp and Light Emitting Diode use became prevalent because of their advantages over the incandescent light. The researchers were able to develop and implement a PID controlled lighting system using Light Emitting Diode utilizing the smoothing-averaging technique in its sensors. Tests were done with the system with and without smoothing technique to identify the effect of the technique used. The system automatically varies its light intensity output depending on the light stimuli maintaining the luminance level of the laboratory based on standards.

scholarly journals Interpretation of Digital Chest Radiographs: Comparison of Light Emitting Diode versus Cold Cathode Fluorescent Lamp Backlit Monitors

2013 ◽  
Vol 14 (6) ◽  
pp. 968 ◽  
Author(s):  
Hyun-ju Lim ◽  
Myung Jin Chung ◽  
Geewon Lee ◽  
Miyeon Yie ◽  
Kyung Eun Shin ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Chest Radiographs ◽  
Cold Cathode ◽  
Fluorescent Lamp ◽  
Light Emitting ◽  
Digital Chest

scholarly journals PENGGUNAAN LIGHT EMITTING DIODE PADA LAMPU CELUP BAGAN (The Use of Light Emitting Diode on Sunked Lamps of Lift Net)

2016 ◽  
Vol 4 (2) ◽  
pp. 141
Author(s):  
Imanuel M. Thenu ◽  
Gondo Puspito ◽  
Sulaeman Martasuganda
Keyword(s):  
Key Words ◽  
Lower Cost ◽  
Light Emitting Diode ◽  
The Other ◽  
Fluorescent Lamp ◽  
Light Emitting ◽  
Led Light ◽  
Fluorescent Lamps ◽  
Energy Save

<p>ABSTRACT<br />Lift net fishermen usually use fluorescent lamp as attractor to lure fish. As price of fuel rise, fishermen are forced to find another option to change their attractor into some much lower cost and more energy-save lamp, or in other words, to change into LED lamp. This research are providing evidence that sunked LED lamps can be utilized as a helper tools, and also determined the best time for catching fish in the lift net. Two lift net used in this research, one of them used sunked LED lamps and the other used ordinary fluorescent lamps. Lift net are operated as long as 20 nights, with four catching times per night, between 18.00-21.00, 21.00-00.00, 00.00-03.00, and 03.00-06.00. Results showed that LED lamps give a better result with 11 organisms successfully catch (287,6 kg), compared to ordinary fluorescent lamps with only six organisms (238,3 kg). The best time for catching with LED lamps are between 18.00-21.00 (121 kg), while between 21.00-00.00 (67,4 kg), 00.00-03.00 (46,9 kg) and 03.00-06.00 (52,3 kg).<br />Key words: fluorescent lamp, lift net, light emitting diode, Palabuhanratu,sunked lights</p><p>-------</p><p><br />ABSTRAK<br />Nelayan bagan biasa menggunakan lampu fluorescent sebagai atraktor untuk memanggil ikan. Harga bahan bakar yang mahal menyebabkan nelayan harus beralih memakai jenis lampu lain yang hemat energi, seperti lampu LED (light emitting diode) Penelitian bertujuan untuk membuktikan bahwa lampu celup LED dapat digunakan sebagai alat bantu penangkapan ikan pada bagan dan menentukan waktu operasi penangkapan terbaik. Dua bagan digunakan dalam penelitian ini. Masing-masing menggunakan lampu celup LED dan lampu fluorescent. Bagan dioperasikan selama 20 malam. Dalam 1 malam dilakukan 4 kali penangkapan, yaitu antara jam 18.00-21.00, 21.00-00.00, 00.00-03.00 dan 03.00-06.00. Hasil penelitian menunjukkan bahwa penggunaan lampu celup LED pada bagan menghasilkan 11 jenis organisma tangkapan seberat 287,6 kg, atau lebih banyak dari lampu fluorescent sejumlah 6 organisma (238,3 kg). Adapun waktu penangkapan terbaik pada bagan yang menggunakan lampu LED adalah antara pukul 18.00-21.00 yang menghasilkan tangkapan seberat 121 kg, sedangkan 21.00-00.00 (67,4 kg), 00.00-03.00 (46,9 kg) dan 03.00-06.00 (52,3 kg).<br />Kata kunci: lampu fluorescent, bagan, light emitting diode, Palabuhanratu, lampu celup</p>

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