Optimum Cultivation Condition of Dunaliella Salina: Effects of Light Emitting Diode as a Lighting Source, Temperature, Light Intensity and Air Flow Rates

In this study, our proposed ultraviolet light-emitting diode (UV LED) mosquito-trapping lamp is designed to control diseases brought by insects such as mosquitoes. In order to enable the device to efficiently catch mosquitoes in a wider area, a secondary freeform lens (SFL) is designed for UV LED. The lens is mounted on a 3 W UV LED light bar as a mosquito-trapping lamp of the new UV LED light bar module to achieve axially symmetric light intensity distribution. The special SFL is used to enhance the trapping capabilities of the mosquito-trapping lamp. The results show that when the secondary freeform surface lens is applied to the experimental outdoor UV LED mosquito-trapping lamp, the trapping range can be expanded to 100π·m2 and the captured mosquitoes increased by about 300%.

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Effects of dimming light-emitting diode street lights on light-opportunistic and light-averse bats in suburban habitats

Royal Society Open Science ◽

10.1098/rsos.180205 ◽

2018 ◽

Vol 5 (6) ◽

pp. 180205 ◽

Cited By ~ 4

Author(s):

Elizabeth G. Rowse ◽

Stephen Harris ◽

Gareth Jones

Keyword(s):

Light Intensity ◽

Field Experiment ◽

Biodiversity Conservation ◽

Management System ◽

Light Emitting Diode ◽

Local Authorities ◽

Ecological Benefits ◽

Carbon Footprints ◽

Light Emitting ◽

Central Management

Emerging lighting technologies provide opportunities for reducing carbon footprints, and for biodiversity conservation. In addition to installing light-emitting diode street lights, many local authorities are also dimming street lights. This might benefit light-averse bat species by creating dark refuges for these bats to forage and commute in human-dominated habitats. We conducted a field experiment to determine how light intensity affects the activity of the light-opportunistic Pipistrellus pipistrellus and light-averse bats in the genus Myotis. We used four lighting levels controlled under a central management system at existing street lights in a suburban environment (0, 25, 50 and 100% of the original output). Higher light intensities (50 and 100% of original output) increased the activity of light-opportunistic species but reduced the activity of light-averse bats. Compared to the unlit treatment, the 25% lighting level did not significantly affect either P. pipistrellus or Myotis spp. Our results suggest that it is possible to achieve a light intensity that provides both economic and ecological benefits by providing sufficient light for human requirements while not deterring light-averse bats.

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Anti-Glare Device for Car Based on Single Chip Microcomputer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.706-708.1124 ◽

2013 ◽

Vol 706-708 ◽

pp. 1124-1127

Author(s):

Hai Xia Li

Keyword(s):

Light Intensity ◽

Light Emitting Diode ◽

Lamp Method ◽

Single Chip ◽

Single Chip Microcomputer ◽

Light Emitting ◽

High Beam ◽

The Core

Because the car headlamp light intensity is too large and it leads to accidents, This paper is based on the initiative to reduce the light intensity of their vehicles according headlights glare or close the high beam and open the lamp method, to achieve the purpose of the glare. The system is AT89C51 microcontroller as the core control, use of photodiode sensor to induction opposite the car headlights light intensity , when opposite car headlights light intensity up to a certain value, photodiode get a signal to the microcontroller ,and then microcontroller sends a signal, to control buzzer sound or not. When the buzzer sounded, using DAC0832 chip to control the brightness of the light emitting diode or control the light on and off and low beam enabled. When enabled for dipped beam, has been more than the antiglare range; after the scope enabled high beam, in order to achieve the anti-dazzle cycle. Through practice, the system has reached the anti-dazzle purpose and has practical value .

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Battery Charge Affects the Stability of Light Intensity from Light-emitting Diode Light-curing Units

Operative Dentistry ◽

10.2341/15-294-l ◽

2017 ◽

Vol 42 (5) ◽

pp. 497-504 ◽

Cited By ~ 3

Author(s):

A Tongtaksin ◽

C Leevailoj

Keyword(s):

Light Intensity ◽

Light Emitting Diode ◽

Resin Composite ◽

Bottom Surface ◽

Light Emitting ◽

Led Light ◽

Battery Charge ◽

Light Intensities ◽

Light Curing ◽

The Stability

SUMMARY This study investigated the influence of battery charge levels on the stability of light-emitting diode (LED) curing-light intensity by measuring the intensity from fully charged through fully discharged batteries. The microhardness of resin composites polymerized by the light-curing units at various battery charge levels was measured. The light intensities of seven fully charged battery LED light-curing units—1) LY-A180, 2) Bluephase, 3) Woodpecker, 4) Demi Plus, 5) Saab II, 6) Elipar S10, and 7) MiniLED—were measured with a radiometer (Kerr) after every 10 uses (20 seconds per use) until the battery was discharged. Ten 2-mm-thick cylindrical specimens of A3 shade nanofilled resin composite (PREMISE, Kerr) were prepared per LED light-curing unit group. Each specimen was irradiated by the fully charged light-curing unit for 20 seconds. The LED light-curing units were then used until the battery charge fell to 50%. Specimens were prepared again as described above. This was repeated again when the light-curing units' battery charge fell to 25% and when the light intensity had decreased to 400 mW/cm2. The top/bottom surface Knoop hardness ratios of the specimens were determined. The microhardness data were analyzed by one-way analysis of variance with Tukey test at a significance level of 0.05. The Pearson correlation coefficient was used to determine significant correlations between surface hardness and light intensity. We found that the light intensities of the Bluephase, Demi Plus, and Elipar S10 units were stable. The intensity of the MiniLED unit decreased slightly; however, it remained above 400 mW/cm2. In contrast, the intensities of the LY-A180, Woodpecker, and Saab II units decreased below 400 mW/cm2. There was also a significant decrease in the surface microhardnesses of the resin composite specimens treated with MiniLED, LY-A180, Woodpecker, and Saab II. In conclusion, the light intensity of several LED light-curing units decreased as the battery was discharged, with a coincident reduction in the units' ability to polymerize resin composite. Therefore, the intensity of an LED light-curing unit should be evaluated during the life of its battery charge to ensure that sufficient light intensity is being generated.

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The design of radiology viewing box using light emitting diode and potentiometer

GHMJ (Global Health Management Journal) ◽

10.35898/ghmj-1196 ◽

2017 ◽

Vol 1 (1) ◽

pp. 10

Author(s):

Anak Agung Aris Diartama ◽

Susy Suswaty ◽

Win Priantoro ◽

Sugiyanto Sugiyanto ◽

Sudiyono Sudiyono ◽

...

Keyword(s):

Light Intensity ◽

Research Method ◽

Applied Research ◽

Light Emitting Diode ◽

Light Emitting ◽

A Value ◽

The Mean

Background: In the process of work to gain the maximum results, a radiologist needs a viewing box tool to read radiographs. Therefore, the authors want to develop a viewing box tool, which in general the work if this tool resembles the factory manufactured tool. The viewing tool box made can adjust the intensity of the light produced.Objective: to create a viewing box tool by using a potentiometer system.Methods: This study used applied research method by creating and using the design of viewing box tool by using a potentiometer system and testing the viewing box tool created by using a Lux meter and 15 respondents consisting of five radiologists and 10 radiographers who should fulfill the questionnaire form.Results: The mean of viewing box illumination reached 220 lux. The results of the questionnaire showed that 100% radiologist gave an A (excellent) and expressed that the viewing box tool created could be used properly and 90% radiographers provided an A (excellent) and expressed that the viewing box tool created could be used properly, while 10% radiographer gave a value of B (moderate).Conclusion: viewing box tool created could be used properly and obtained optimal results as a tool in reading radiographs. Potentiometer system contained in the viewing box was very helpful in reading radiographs because it allowed to adjust the light intensity according to user needs.Keywords : Viewing box, Potentiometer Bibliography : 1980-2011

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High-Performance Structure of Light-Emitting Diode for GaAs on Si Tetsuroh Minemura

MRS Proceedings ◽

10.1557/proc-240-511 ◽

1991 ◽

Vol 240 ◽

Author(s):

Junko Asano ◽

Yoshiaki Yazawa

Keyword(s):

Light Intensity ◽

High Performance ◽

Light Emitting Diode ◽

Gaas Layer ◽

Continuous Operation ◽

Light Emitting ◽

Si Substrates ◽

Gaas On Si ◽

Performance Structure

ABSTRACTThe Light-emitting diode (LED) structures have been investigated to realize high-performance LEDs on Si substrates. The light intensity of the LEDs with p-GaAs / n-GaAs / Si structures, which was effected from thickness of the p-GaAs layer, was only about 55% of the homoepitaxialLED. The light intensity of the LED with an n-GaAs/p-GaAs/Si structure, however, was about four times stronger than those of p-GaAs/n-GaAs/Si structures. After continuous operation for two hours, the intensity still kept much stronger than those of the LEDs with p-GaAs / n-GaAs / Si structures, although it decreased to 15% of the homoepitaxial LED.

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