Brighter and More Efficient Solid-State Lighting Using Laser Diodes

Solid-state lighting in the form of Light Emitting Diodes (LEDs) converts electrical energy into visible light with greater efficiency and less heat loss when compared to incandescent or fluorescent lights.Above a certain current, however, LEDs become less efficient and convert less of their electrical energy into light. This is a condition known as droop, which makes the use of LEDs in high-power applications difficult.

The next generation of solid-state lighting may use laser diodes, which overcome some of the LEDs limitations by operating at higher power and optical intensities, but are about the same size.As lasers are brighter than LEDs, they require fewer diodes for an equivalent light source, which makes the device cheaper and more compact.White Light SourcesLEDs and laser diodes share one characteristic they are monochromatic, or emit a single color of light.

To create white light from either source, we use one of two methods.The first method combines the primary colors red, green and blue to create white light.The second method of creating white light uses either a blue or ultra-violet diode along with phosphors to down convert the higher frequency light into a range of lower frequencies.

By blending phosphors in the right combination, we can get something that looks like white light.Phosphor Driven White Solid-State LightingThere are several complications affecting our ability to blend phosphors to get white light.Firstly, as a diodes color output can degrade with age or drift with temperature, its necessary to use complex optics and electronics to actively monitor and control color output.

LEDs can be coated with phosphors to generate white light, but the heat they generate can degrade phosphors over time.As phosphor-coated LEDs generate visible light sources, we need optics to diffuse the light beam.If we separate the phosphor from the LED, however, it overcomes these issues.

Philips currently uses this remote phosphor design, which won the L Prize in 2011, a competition run by the US Department of Energy to encourage lighting manufacturers to develop high-quality, high-efficiency solid-state lighting products.Laser Diodes for Remote Phosphor DesignIn a recent paper, Kristin A. Denault and a research team at the Solid-State Lighting and Energy Center and Materials Department, UC Santa Barbara tested the lighting output of a remote phosphor design using laser diodes.

The group tested color output using a blue laser to produce a cool white light with a CCT of 4,400 K and a near UV laser to produce warm white light with a CCT of 2,700 K.The UCSB team also used their data to calculate the maximum efficacy for blue laser diodes, a measure of how well a light source can potentially produce visible light. This calculation allows the group to gauge the possible capabilities of future laser based white light devices.

They found a maximum efficacy of 78 lm/W for the blue laser diode which is comparable to a luminous efficacy of LEDs currently on the market. Improvements in wall plug efficiency to 75% could increase this number to 200 lm/W, bringing it in line with the Department of Energys goal for solid-state lighting and making laser diodes a viable high-power solid-state lighting candidate for the future.Solid-State Lighting: The FutureLaser diodes and LEDs both suffer limitations when it comes to high power lighting.

LEDs suffer from efficiency droop, a problem first reported in 1999 where light output decreases if the current is increased beyond a critical point.Laser diodes problems stem from their low wall plug efficiency, currently around 30% but an increase to 75% would make laser diodes an attractive high power lighting option.Technological advances are overcoming the problems of both devices.

A recent paper by Rensselaer Polytechnic Institute researchers has identified the mechanism behind droop a phenomenon known as electron leakage due to the slight differences in the movement of charge carriers through a semiconducting material results in energy loses.The group believes their findings could lead to the development of new semiconductor structures that will lead to more efficient devices.A fundamental factor limiting wall-plug efficiency of laser diodes is the material properties of the semiconductor itself.

Each material contributes a certain electrical resistance, optical loss and thermal resistance researchers are making improvements all the time. Though laser diodes are currently less efficient than LEDs, they have the potential to go beyond where LEDs are currently.When asked about the future of laser diode lighting and its comparison to LEDs, Denault, co-author of the study on laser-diodes for solid-state lighting, told Decoded Science, I think that as laser diode technology improves and people begin to be aware of the benefits of using laser diodes as an excitation source in solid-state white lighting, more applications and advantages will become apparent.

ResourcesDenault, K. A. , Cantore, M.

, Nakamura, S. , DenBaars, S. P.

, & Seshadri, R. Efficient and stable laser-driven white lighting. (2013).

AIP Advances. Accessed August 18, 2013.Meyaard, D.

S., Lin, G.-B.

, Cho, J., Fred Schubert, E., Shim, H.

, Han, S.-H., Sun Kim, Y.

Identifying the cause of the efficiency droop in GaInN light-emitting diodes by correlating the onset of high injection with the onset of the efficiency droop. (2013). Applied Physics Letters.

Accessed August 18, 2013.Xu, Y., Chen, L.

, Li, Y., Song, G., Wang, Y.

, Zhuang, W., & Long, Z. Phosphor-conversion white light using InGaN ultraviolet laser diode.

(2008). Applied Physics Letters. Accessed August 18, 2013.

Future Lighting Solutions. Remote Phosphor. (2013).

Accessed August 18, 2013. Lighting Research Center, What is an LED? (2003).

Accessed August 18, 2013.Originally published at on August 18, 2013 RELATED QUESTION What is proffesional led stage lighting? When you're putting on an occasion, whether it is an unassuming school play or a party, stage lighting rental is an unquestionable requirement.

Lighting is a main thrust of your production, giving brightening, center, detail and modifying the view of the group of audience. There is nothing that so vitally passes on an inclination superior to a decent lighting system, and with boundless inventive potential, will serve as an immense advantage for your creation. Focus, position and hanging: Conventional stage lighting must be set up because of these three contemplations.

Focus refers to where the light will point; position alludes to where the light will start from; hanging refers to the real demonstration of hanging the light. Shading, force and example (assuming any) should be considered next. Types of stage lighting : Ellipsoidal - these lights are the conventional stage lights and thought to be the most critical.

They are centering lights, the appearance in front of an audience of which can be adjusted by screens and channels. Fresnel - these lights are utilized for shading washes on the stage. Standard Jars - these lights are the sort you will see in even the dingiest of bars.

Continuously a strong choice, standard jars can get hammered, are sturdy and simple to transport. Follow spots - these are spotlights used to pursue somebody around a phase. Obviously, there are increasingly choices accessible for stage lighting with the consistent progress of innovation.

Presently you have the fundamentals; here are a couple of more alternatives: LEDs - these Professional LED Stage Lighting are useful for centered pillars and have been gradually supplanting conventional globules in stage lighting. Dizzies - these lights are round circles with a few Drove lights (more often than not of varying hues) covering the surface. The circle pivots in an assortment of bearings and examples, making a whirling, confounding example, consequently the name.

Gels - this term alludes to the hues given to lights. They function as shading channels, and should work in congruity with the shade of the light itself to accomplish the craved impact. Once you have got your types of lighting down, you'll have to consider where to place them.

Here's an essential summary of lighting positions: Front - This is utilized for the most part for perceivability and shading impacts. Side - can be utilized to awesome impact to complement activity. Back - Additionally utilized for impact.

This kind of lighting can make the dream of profundity on a phase, or notwithstanding to silhouette a man totally.

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Sources and Relevant Studies:LED Lighting Flicker and Potential Health Concerns: IEEE Standard PAR1789 Update (November 2010)University of Essex, United Kingdom | National Research Council, Canada | Northeastern University, United StatesIEEE 17892015 IEEE Recommended Practices for Modulating Current in High-Brightness LEDs for Mitigating Health Risks to Viewers (March 2015)IEEE Standards Association, United StatesFlicker: Understanding the New IEEE Recommended Practice (May 2015)U.S. Department of Energy, United StatesCharacterizing Photometric Flicker (February 2016, November 2018)U.S. Department of Energy, United StatesMeasuring Flicker: Californias JA10 Test Method and Its Uses (June 2016)Energy Star, U. S. Environmental Protection Agency, U. S. Department of Energy, United StatesBuilding Energy Efficiency Title 24 Appendix JA10 Test Method for Measuring Flicker of Lighting Systems and Reporting Requirements (2016)California Energy Commission, United StatesThe Effect of Office Lighting Strobe on Human Physiology (October 2018)Institute for Electric Light Sources, Fudan University, Shanghai, ChinaPotential Biological and Ecological Effects of Flickering Artificial Light (2014)University of Exeter, United Kingdom | Southern Illinois University, United StatesTest LED fixtures for flicker with your smartphone:Weve put together an easy, step-by-step guide to test for flicker yourself.Want to learn more about LED Flicker?Visit our LED Flicker webpage, or reach out to me directly at you for reading! RELATED QUESTION What is proffesional led stage lighting? When you're putting on an occasion, whether it is an unassuming school play or a party, stage lighting rental is an unquestionable requirement. 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Why TORY LIGHT led stage lighting equipment is priced higher?
Why TORY LIGHT led stage lighting equipment is priced higher?
The brand name for GUANGZHOU TORY LIGHT CO.,LIMITED is well remembered by customers mainly with the help of its high quality and outdoor led par. TORY advances with the times and pays attention to independent innovation and strict quality control during production. By adhering to the core value, we pay great attention to first-class service and first-class quality, so as to become a first-class enterprise. We intend to be innovative, hard-working and tenacious and promise to be your best partner with the best reputation. static light is widely used in multi-purpose halls, studios, conference centers, auditoriums, theaters, concerts, stadiums, dance halls, and other entertainment venues. The led stage lighting is one of the main products of TORY. static light's popularity has close relation with the its features such as kinetic led balls. The product is anti-glare, causing no visual fatigue. TORY exerts strong prolificacy from its factory, supply shortcut delivery. Emitting zero ultraviolet ray and infrared ray, it's safe for users. If you have any questions, feel free to consult us.How industrial production of smoked tofu? Raw material Formula: soybean (soybean) is the main raw material for making tofu ),It is better to use new beans with neat particles, no impurities, no insect eyes, no mildew and deterioration.Bean curd,Salt brine (magnesium chloride) is generally used ),The dosage accounts for about 3% of raw materials (solid ),Dilute 1: 2 with water,Beauty 16 ~ 18 degrees,Use after filtering.The tofu made of salt is slightly rough and stiff.It is also called North tofu or big tofu.Tofu is made with gypsum (calcium sulfate) as a coagulation agent,The finished product is small,White color,Soft texture,Also known as water tofu or South tofu.Plaster press 1:1 before use.5 proportion of water grinding,Add water and adjust it to a suspended liquid of 5 times,Use the cutting bottom.Defoamer for tofu,You can use oil feet or vegetable oil plus calcium hydroxide to stir them at 10: 1,After fermentation into thin paste,Use 1%.It is also possible to use the sCan the water purifier filter out calcium carbonate in the water? There are many categories of water purifiers, but only the RO machine can filter calcium carbonate in water, and only the RO film can separate ions in water, but RO has the opportunity to produce a certain amount of wastewater (PUS ), at present, this kind of water purifier is widely sold on the market. The calcium carbonate water purifier that can filter out the water is also called the water purifier. According to the composition structure of the filter element, it is divided into RO reverse osmosis water purifier, UF water purifier, energy water purifier and ceramic water purifier. RO reverse osmosis water purifier comes standard with Grade 5 filtration, that is, Grade 5 of PP cotton, granular carbon, compressed carbon, RO reverse osmosis membrane and rear activated carbon (also known as small T33); ultra-filtration water purifier is mainly based on ultra-filtration membrane, other filter elements such as activated carbon (excluding energy f
2019 06 06
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What are performance advantages of professional led stage lighting ?
What are performance advantages of professional led stage lighting ?
The filtration accuracy of the water purifier is 0.5 microns. what can be filtered out? It's not a lot of use. my worst one is the 1% micron filter. For your own health, change the precision high point. 1um = 1000nm. most viruses have a diameter of 100nm (20 ~ 200nm), the larger virus diameter is 300-450 nm (nm), the smaller virus diameter is 18-22 nm, and what can be filtered out by UM?GUANGZHOU TORY LIGHT CO.,LIMITED entrepreneurs have gradually cultivated and formed the entrepreneurial spirit of moving light led. Check now! The Professional led stage lighting Manufacturer in the Manufacturing Lights & Lighting Industry Compared with similar products, TORY's moving head light is more advantageous in the following aspects. TORY always provides customers with reasonable and efficient one-stop solutions based on the professional attitude.What are the industrial dust removal technologies? The methods of dry dust removal are: settling to dust,Bag dust removal,Filter cartridge dust removal,Electrostatic dust removal,Mixed dust removal;The methods of wet dust removal are: spray dust removal, spray, Ma Shi, Cyclone, water curtain, etc.Biological nano-film dust suppression: also known as biological nano dust suppression,It is from the source of dust production to suppress dust by spraying biological nano-film.The patented biological nano-film has the characteristic of stable nano-layer spacing structure,Attract and reunite small particles of dust with its own charge,To aggregate it into large particles,Self-respect settles over air buoyancy.Cloud and dust suppression: through high-pressure ion atomization and Ultrasonic atomization,Can produce 1 μm ~ Ultra-fine fog of 100 μm,Fine fine mist particles,Fully increase the contact area with dust particles.Fog particles collide and condense with dust particles,Form reunion,The reunion is getting bigger
2019 06 06
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Contact us
  • Cel : +86 158-2024-2923
  • Tel(Fax) : +86 020-29835956
  • E-mail : info@torylight.com
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  • Add : No.1, XinHe Industrial Park, Huadu
  • District, Guangzhou, CHINA
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