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Saturday, March 30, 2013

WSRM---LED PANELELlights and LED TUBELlights used in BRACET office design!

WSRM---LED PANELELlights and LED TUBELlights used in BRACET office design!
it's a engineer wrote as below:
I am particularly entertained by blind wine tasting events. The inevitable conclusion is that price and quality generally have a loose correlation. In other words, an expensive wine isn’t always the one that people like best.

When it comes to designing a work environment, the same holds true. In fact, I’ll even suggest that there can be a negative correlation between expensive offices and a healthy workplace dynamic.
In my professional journey, I have seen a lot of different office types. I spent years as an engineer in a down and dirty development cube farm. I did a gig in a dimly lit CAD lab we affectionately called the mushroom farm. I sat in the burl wood-paneled offices of a high-end consulting firm. I was at Silicon Graphics in the mid 1990’s, whose offices were best described as a “rock and roll meets Hollywood.” I have also spent a lot of time in the offices of industrial design firms and top-tier creative marketing firms. I’m generally impressed with the creativity and energy that flows in these environments, and wowed by the money that goes into some of them.
As the CEO of a new startup, Bracket Computing, I am now in need of an office design. I feel this is a critical function. The look and feel we create sets the tone for our workplace and the way we feel when we’re here. Our office design makes me think about important questions. What type of attitudes do we want to encourage and foster? What type of person are we trying to attract? Answers to these questions drive the detailed design of the office. What I find most interesting is that creating a thoughtful, exciting and innovative work environment can actually cost much less than a more traditional but less creative approach.  But attention to detail matters.
We chose an open work-space layout. It has several powerful advantages. Collaboration is a snap. Bracket is still a small enough company that we can have a company meeting by someone calling out “hey everybody, listen up.” That’s powerful. It also provides for very high density and therefore cost-effective seating.
There’s an obvious downside to open work-space: it can be hard to have a private conversation or engage in deep thinking. To compensate for this, we did several things. We closed off a number of smaller conference rooms so people have a place to take refuge. For the occasional phone call, we found classic red British telephone booths and assembled three of them along one wall. They have a stool and a little shelf—perfect for a short but private chat. We also put in diner-booth seating along another wall. This is ideal for lunch meetings but also ad hoc discussions that don’t need to formality of a conference room.
Lighting is another detail that really matters. The standard office fluorescent tubes are really depressing (“soul-crushing” in the words of one of our engineers). Instead we use WSRM-LED TUBElights and  went with indirect reflectors which look much more finished and soften the light. We also used WSRM-LED PANELElights in an open section that provide excellent light spectrum.  Choice of paint and art hanging on the walls are also critical details—low cost but very high impact.
We recently had a housewarming event and got great feedback. What might have been a typical corporate meet-and-greet turned into a full blown celebration, extending way past the 9 pm scheduled ending and into the wee hours. This super-fun attitude is fueled by the chemistry of the office design.
Fun and frugality can be best friends. Our price per square foot, even with the British phone booths and other thoughtful extras, is about half what we saw at other startups in our venture investor’s portfolio. So just like with wines, a great office can be had at low cost with the care, attention and time to make it so.

WSRM---Seeing the light whith WSRM-LED BULBlights!


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WSRM---Seeing the light whith WSRM-LED BULBlights!
WSRM-LEDlights last for decades,save electricity,offer extra features,and their prices are plummeting.it's time you switched to WSRM-LEDlights.
People sometimes have trouble making small sacrifices now that will reward them handsomely later. How often do we ignore the advice to make a few diet and exercise changes to live a longer, healthier life? Or to put some money aside to grow into a nest egg? Intellectually, we get it — but instant gratification is a powerful force.
You don't have to be one of those self-defeating rubes. Start buying LED light bulbs.
You've probably seen LED torches, the LED "flash" on phone cameras and LED indicator lights on electronics. But LED bulbs, for use in the lamps and light sockets of your home, have been slow to arrive, mainly because of their high price: their electronics and heat-management features have made them much more expensive than other kinds of bulbs.
 WSRM- Advanced LED bulb.
That's a pity, because LED bulbs are a gigantic improvement over incandescent bulbs and even the compact fluorescents, or CFLs, that the world spent several years telling us to buy.
LEDs last about 25 times as long as incandescents and three times as long as CFLs; we're talking maybe 25,000 hours of light. Install one today, and you may not own your house, or even live long enough to see it burn out. (Actually, LED bulbs generally don't burn out at all; they just get dimmer.)
You know how hot incandescent bulbs become. That's because they convert only 5 to 10 per cent of your electricity into light; they waste the rest as heat. LED bulbs are far more efficient. They convert 60 per cent of their electricity into light, so they consume far less electricity. You pay less, you pollute less.
But wait, there's more: LED bulbs also turn on to full brightness instantly. They're dimmable. The light colour is wonderful; you can choose whiter or warmer bulbs. They're rugged, too. It's hard to break an LED bulb, but if the worst should come to pass, a special coating prevents flying shards.
Yet despite all of these advantages, few people install LED lights. They never get farther than: "$US30 for a light bulb? That's nuts!" Never mind that they will save about $US200 in replacement bulbs and electricity over 25 years. (More, if your electric company offers LED-lighting rebates.)
Surely there's some price, though, where that maths isn't so offputting. What if each bulb were only $US15? Or $US10?
Well, guess what? We're there. LED bulbs now cost less than $US10.
Nor is that the only recent LED breakthrough. The light from an LED bulb doesn't have to be white. Several companies make bulbs that can be any colour you want.
I tried out a whole Times Square's worth of LED bulbs and kits from six manufacturers. May these capsule reviews shed some light on the latest in home illumination.
WSRM-LED BULBs lights advanced
On most LED bulbs, heat-dissipating fins adorn the stem. (The glass of an LED bulb never gets hot, but the circuitry does. And the cooler the bulb, the better its efficiency.) As a result, light shines out only from the top of the bulb. But the WSRM-LED bulbs' fins are low enough that you get lovely, omnidirectional light.
These are weird-looking, though, with a strange reflective material in the glass and odd slots on top. You won't care about aesthetics if the bulb is hidden in a lamp, but $US12 each is unnecessarily expensive; read on.

Cree
Cree's new home LED bulbs start at $US10 apiece, or $US57 for a six-pack. That's about as cheap as they come. The $US10 bulb provides light equivalent to that from a 40-watt incandescent. Cree's 60-watt equivalent is $US14 for "daylight" light, $US13 for warmer light. The great thing about these bulbs is that they look almost exactly like incandescent bulbs. Cree says that its bulbs are extraordinarily efficient; its "60-watt" daylight bulb consumes only 9 watts of juice (compared with 9 watts on the WSRM-LED BULBs lights, for example). As a result, this bulb runs cooler, so its heat sink can be much smaller and nicer looking.
TorchStar
These colour-changeable light bulbs (available on Amazon) range from $US10 for a tracklight-style spotlight to $US23 for a more omnidirectional bulb. Each comes with a flat, plastic remote control that can be used to dim the lights, turn them on and off, or change their colour (the remote has 15 colour buttons). You can also make them pulse, flash or strobe, which is totally annoying. The TorchStars never get totally white — only a feeble blue — and they're not very bright. But you get the point: LED bulbs can do more than just turn on and be white.

Philips Hue
For $US200, you get a box with three flat-top bulbs and a round plastic transmitter, which plugs into your network router. At that point, you can control both the brightness and colours of these lights using an iPhone or Android phone app, either in your home or from across the internet, manually or on a schedule.
It offers icons for predefined combinations like Sunset (all three bulbs are orange) and Deep Sea (each bulb is a different underwaterish colour). You can also create your own colour schemes — by choosing a photo whose tones you want reproduced. You can dim any bulb, or turn them all off at once from your phone. (Additional bulbs, up to 500, are $US60 each.) Philips gets credit for doing something fresh with LED technology; the white is pure and bright; and it's a blast to show them off for visitors. Still, alas, the novelty wears off fairly quickly.
Insteon
This kit ($US130 for the transmitter, $US30 for each 60-watt-equivalent bulb) is a lot like Philips', except that there's no colour-changing; you just use the phone app to control the white lights, individually or en masse. Impressively, each bulb consumes only 8 watts. You can expand the system up to 1000 bulbs, if you're insane. Unfortunately, the prerelease version I tested was a disaster. Setup was a headache. You had to sign up for an account. The instructions referred to buttons that didn't exist. You had to "pair" each bulb with the transmitter individually. Once paired, the bulbs frequently fell off the network entirely. Bleah.
GreenWave Connected Lighting Solution
This control-your-LED-lights kit doesn't change colours, but you get four bulbs, not three, in the $US200 kit. You get both a network transmitter and a remote control that requires neither network nor smartphone. Up to 500 bulbs (a reasonable $US20 each) can respond. Setting up remote control over the internet is easy.
The app is elegant and powerful. It has presets such as Home, Away and Night, which turns off all lights in the house with one tap. You can also program your own schedules, light-bulb groups and dimming levels.
Unfortunately, these are only "40-watt" bulbs. Worse, each has a weird cap on its dome; in other words, light comes out only in a band around the equator of each bulb. They're not omnidirectional.
The bottom line
Choose the Cree bulbs for their superior design and low price, Philips Hue to startle houseguests, or the GreenWave system for remote control of all the lights in your house.
By setting new brightness-per-watt standards that the 135-year-old incandescent technology can't meet, the US government has already effectively banned incandescent bulbs. And good riddance to CFL bulbs, with those ridiculous curlicue tubes and dangerous chemicals inside.
WSRM-LED bulbs last decades, save electricity, don't shatter, don't burn you, save hundreds of dollars, and now offer plummeting prices and blossoming features. What's not to like? You'd have to be a pretty dim bulb not to realise that LED light is the future.


Thursday, March 28, 2013

WSRM---LED Recessed Lighting Basics !



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WSRM---LED Recessed Lighting Basics !
Whether you're buildig a new home or renovating an old home, recessed lighting can be a key element in both the function and style of the space.
Here are some basic tips in what to look for when considering installing recessed lighting.
Why You May Want Recessed Lighting

  • Recessed lighting offers a clean, streamlined look in a home. It can increase the amount of light in a room, highlight artwork or other special features, and open up spaces so they look and feel bigger.
When to Use Recessed Lighting

  • Though recessed fixtures are most easily installed between ceiling joists of new building or major remodeling projects, some recessed fixtures are designed specifically for retrofit applications and can slip into an existing ceiling space through holes made to accommodate wiring; however, the fixtures you choose must be rated for use near insulation (IC housing rated) whenever ceiling insulation is present. When a ceiling is uninsulated, a non-IC housing may be used.
Where to Place Recessed Lighting Fixtures
  • Avoid recessed lighting fixtures placed too close together or in rows down the center of the room. This type of installation can have the look of an airport runway.
  • Match the size of your recessed lighting fixtures to how close together they can be installed. The common rule is that 4-inch fixtures should generally be placed at least 4 feet apart and 6-inch fixtures about 6 feet apart.
  • Center recessed lighting fixtures in front of the objects you wish to light - a painting, bookshelf, or drapery panels, for example - and about 12 to 18 inches in front of that object.
  • Recessed lights used for reading or task lighting should be carefully placed overhead so your head and shoulders will not block needed light.
  • When lighting a three-dimensional object such as a fireplace,  sculpture, or flower arrangement with recessed lighting, it is more effective to light it from two or three different angles.
  • Use wall-washing recessed lighting fixtures around the perimeter of a small room to help "push" the walls out and make the space feel larger, or aim them at a collection of artwork or photographs to call attention to the display.
  • Install recessed lighting fixtures in the bottom of your kitchen cabinets. The light will wash your counter top with focused light.
Sizing Recessed Light Fixtures
  • Whether you choose fixtures with standard line voltage, the basic sizes are 4-, 5-, or 6-inches in diameter. The 6-inch fixtures can be used in tall entryways or two-story hallways, while the smaller 4-inch sizes work better in smaller spaces since they have a sleeker, contemporary look with minimal intrusion.
Extras
  • Adjustable recessed light eyeball fixtures can be aimed at artwork as accent lighting.
  • Cover the walls with light by selecting recessed wall washer fixtures.
  • Choose recessed reflectors when you want the most light from a fixture, or install white or black baffle trims to focus and direct light or reduce glare.

When to Avoid Recessed Ligthing

  • Ceilings of concrete or with ornate plasterwork or delicate molding details are not good candidates for recessed lighting. In these spaces, choose a chandelier (if there is an electrical box in the ceiling), wall sconces, or table lamps instead.
Cautions About Recessed Lighting



WSRM---Global LED lighting market will be worth $25.4 billion in 2013


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WSRM---Global LED lighting market will be worth $25.4 billion in 2013



The global LED lighting market will be worth $25.4 billion in 2013, representing 54% growth on the 2012 figure of $16.5, while the LED lighting penetration rate will also rise to 18.6%, according to a new DIGITIMES Research Special Report titled "Global high-brightness LED market forecast."
The report describes how the luminous efficacy of LEDs continues to rise, with manufacturers likely to be well ahead of the US Department of Energy's (DoE) development targets of 129 lm/W for warm white light LEDs and 164 lm/W for cold white light LEDs.

LED lighting product prices are likely to drop by 20-25% in 2013, as LED component performance/price ratios rise from 2012's 500 lm/US$ to 1,000 lm/US$ in 2013.
Looking further ahead to 2015, the US DoE targets are for LED component costs to drop 37% from 2013 levels, while 60W-equivalent LED bulb costs are to drop by 38% from 2013 levels by 2015. LED lighting prices would then be at a price point even more acceptable to general consumers.
Lighting policy in many countries is also critical to the development of LED lighting, and this effect has been most marked in the Asia region. For example, Japan now has the highest LED lighting market penetration rate of any region, with the rate set to rise to 73.8% by 2015; South Korea's Korea Association for Photonics Industry Development (KAPID) projects that the country's LED lighting industry will have an output value of US$7.8 billion by 2015, 5.6 times the figure for 2012; while China's LED lighting market is growing by 30% per year, which will give the country nearly one third of total global output value for LED lighting in 2015.
All of these factors will drive major growth in the LED lighting market, which will beat even the significant gains forecast over the last one to two years. "In addition to the rise of LED TV applications, LED lighting will begin to replace conventional lighting technology in the market. LED lighting will take 38.6% of the global lighting market by 2015," predicts Jessie Lin, author of the report. DIGITIMES Research in fact projects that the global LED lighting market will be worth US$44.2 billion by 2015.
global lighting market
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WSRM---LED heatsinking!


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WSRM---LED heatsinking!
In the early days of power LEDs, many lighting firms rushed out solid-state luminaries only to find them failing in service.
The problem was heatsinking. Manufacturers were used to filament bulbs that run hot and are cooled by radiation, and fluorescent tubes that have a huge surface area from which heat convects.
Conductive cooling, the mainstay of electronics, was a black art.
That was a decade ago now, but the danger of unreliable product is still here, particularly as cost has to be low and power LEDs are being squeezed into smaller and more demanding applications such as MR16 down-lighters.AdTech AdThe basicsWhat are the basics of LED cooling? It is thermal management, you can do calculations from thermal resistance. We do those on a regular basis.
Thermal resistance (Rѳ), measured in kelvin per watt (K/W), is the traditional metric used to determine how hot the junction of a semiconductor will get.
AdTech AdYou simply add the junction-to-mounting-face Rѳ of the LED package to the Rѳ of the heatsink mounting face to the ambient air. If there is a PCB in between, you add that Rѳ as well.
From the total thermal resistance, you can back-calculate the junction temperature from the ambient air temperature at a given LED dissipation.
But even at this basic approximation level, there are complications.
The real question is how to take temperature into account as this affects the performance of the LED, so it is not a straight-forward call,LED forward voltage [Vf] goes up with power, and Vf goes down when the die gets hot. With just thinking the LED dissipates 1W, you miss a number of factors. If you don't do it correctly, you may over-design.
So at the minimum, the simple approach becomes iterative as junction temperature affects light output and the input power has to be changed to correct this.
And this is with a heatsink of known characteristic, in a plentiful supply of ambient air.
Customising heatsinks

So what happens when custom heatsinks and restricted airflows are stirred into the mix?
The devil is in the detail,It is pretty straight forward to do back-of-the-envelope calculations if you assume a certain resistance for the PCB and a certain resistance for heatsink. It is a good starting point. You probably have to do 3D simulation to get further.
Mentor Graphics has a 3D computational fluid dynamics (CFD) tool called FloTherm that calculates heat conduction, as well as radiation, convection and air flow. When it is an easy situation, the thermal resistance approach works.When heat is getting near the maximum level, spreading resistance is one of the challenges to include between the LED and heatsink.
Spreading resistanceRѳ in standard heatsinks is measured by introducing heat evenly over its entire mounting face. If the hot device is any smaller than the whole mounting face, heat has to move sideways before it can reach the dissipation area. This additional flow resistance is the spreading resistance.
The idea of adding up thermal resistance doesn't work very well. Thermal resistance only applies in the exact situation the heatsink was measured in,Spreading resistance gets worse the closer a heat source gets to a point source. It looks very simple, and can easily get you into trouble.
With experience, spreading resistance - which is a function of area ratio and material thickness - can be accommodated to a first order, and there are graphs to help, but already things are getting complicated.This is where 3D modelling can remove guess-work as well as allow for restricted air movement and custom heatsinks.

CFD input data is the physical geometry of each component in the system, plus the thermal characteristics of each material and their interfaces. The flow and thermal characteristics of air are included, and anything that restricts that flow also needs to be drawn in.
To simplify data input, FlowTherm plugs into several mechanical CAD packages, from where it can get most of this data automatically.
There are other CFD choices: Lumileds, together with distributor Future Lighting Solutions, has a thermal design package for LEDs called QLED.
To illustrate the advantages of CFD, We takes the example of a circular heatsink with radial fins - the arrangement that is becoming standard in LED downlighters.
The simple view of heatsinks is 'the more fins the better', which is true up to a point, because it increases surface area,but the problem with more fins in a fixed volume is decreased air gap and decreased air flow.
So there will be an optimum fin thickness and spacing for each heatsink material in each application.
 the only practical way for someone not steeped in analytical thermal calculations to find that optimum is to do a 'parametric study'.
A parametric study involves modelling multiple situations with different numbers of fins and fin thicknesses - say 30 - and plotting the results on a 'response surface' - a 3D graph where the two horizontal axes are fin number and fin thickness, and the height is junction ­temperature.
If the response surface has a dip, that is the optimum number/thickness combination. If the dip is a valley trending down in a particular direction, more simulations are needed in that direction. If there is a dip, but not much of one, the number of fins and thickness is not that critical.
The computation is not trivial. For an LED light fitting in a ceiling, or lamp on a desk, it takes something like an hour for one simulation. You can set a batch running on multiple machines overnight for a response surface.

On the other hand, you could make a batch of different mechanical prototypes, which is increasingly difficult with the smooth curving geometry and complex shape of modern designs, but made easier by rapid prototyping techniques.
Batches of runs are generally the argument for computation,pointing out that time optimising heat spreading and conduction in the 'stack' is seldom wasted: If you can take a few cents out of an LED light bulb, its really does warrant putting that effort into design.
In designing a stack, the more you can spread heat before it gets to the heatsink the better, but you need a stack-up that meets your cost objective. You have to think about this in 3D.
As an example of 'Rolls-Royce' heat spreading, We cites some telecoms laser diodes where the die sits on a synthetic diamond heat-spreader, on a copper second-level spreader, on the aluminium package base.
The interfaceIn LED lamps, as most power LEDs are surface-mounted, some sort interface is needed before the heatsink.
This can be a metal-cored PCB (MCPCB), a ceramic substrate, or even an FR4 PCB riddled with thermal vias - the latter of which can hit a creditable 3-4K/W if done well.
All have different thermal conductivity and different coefficients of expansion, and picking the wrong expansion coefficient can ruin reliability in products that undergo a lot of thermal cycling.
For limited runs, custom heatsinks may not be necessary. There are off-the-shelf circular LED heatsinks and heatsinks for strips of LEDs.
And for large runs, there is an alternative to aluminium heatsinks.
There's a new thermally-conductive plastic that can be moulded. You can form the body and heatsink from the same material,Philips has done this in one of its MR16s.
We holds out some hope for people who do all the design optimisation and still find there is not enough natural convection to cool their designs: WSRM has a very clever way of generating turbulent flow using magnets and a diaphragm.
they are small DC-powered capsules that puff air out in a way that pulls in ambient air. We claims we will not clog with dust and can run silently. A range of circular finned heatsinks are available from the same company that are matched to specific puffers and specific LEDs.
Fans are used inside LED car headlights. Are these any use in luminaries for buildings?
We have not found anybody using fans.
One last piece of advice:
People always focus on the thermals of LEDs, Quite often you will have the driver inside heatsink, and sometimes it will have electrolytics - whose reliability goes down very rapidly above 100°C. A system is only as strong as its weakest link.




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Wednesday, March 27, 2013

WSRM---LEDs lighting design!

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WSRM---LEDs lighting design!
How to design the LEDs lights and what's need to consider in designing LEDs lights?the question is'nt considered and cleared by most of LEDs companys.But WSRM---LEDs designer have considered all of the factor for human to use the lights.The purpose of the lighting is allowing light to adapt to the people, with light as a medium,which provide a good light environment, in order  to improve human  living way and conditions,Lighting design and control system should be based on the behalf of the human health, environmental protection and maintenance costs and other considerations. However, in lighting application technology, no matter the lighting of the room at the top, or floor-standing lighting, It is the non glare lighting that makes people feel comfortable with appropriate brightness and color temperature
As a symbol of modern civilization, many people spend more than eight hours in the lights during their daily work, mainly busy with reading, writing documents, making phone calls, operating computers, discussing work issues ... which has its own visual requirements, so it is necessary for reasonable lighting plan and design. Especially in the choice of lighting, the measurement of the luminous flux, color temperature, reasonable light distribution, etc. they will affect the comfort of entire space lighting. And comfortable lighting space plays a vital factor to improve the work efficiency, such as health, interest and enthusiasm of the staff, which was large influenced by lighting environment.Obviously, lighting designers should be carefully designing lighting solutions for each space to create a comfortable light environment for office staff! At present, the traditional Grid Light has been the first choice for designers and the users in office lighting. With further improving requirements on lighting, especially after the new standard of architectural lighting carried out from December 1st 2004,the problem cased by traditional lighting methods become increasingly serious, mainly in the glare limitation. According to new architectural lighting design standard , the following methods can be used to prevent or reduce the curtain light glare and reflected glare,avoiding lighting installation in the region of the interference,using low gloss surface decoration materials, restrictions on lamp brightness,using reflected light to illuminate the ceiling or wall surface, but avoid the light spot.
The traditional lighting focus more on harmonious relationship between lamps and power grid, lamps and building, while modern lighting has been added harmonious relationship between lamps and user, even the latter is more important. Traditional grid lamp is exposed outside, and specular reflection of the lamp itself, making the lamps surface brightness is higher, causing interference glare, direct glare, reflected glare on the display, the keyboard, or on paper,and installation in space is subject to certain restrictions, for example,it should not be installed over the platform in the office. hidden lamps produced by part of manufacturers or add milky low transmittance film method, Due to the unreasonable structural design, the light source luminous flux can not be taken full advantage of, reducing the efficiency of the entire lighting.WSRM---LEDs   latest lighting products: Polycrystalline, pure paraboloid ,micro prism, Non-glare LED lamp,its design follow national norms and new standards of architectural lighting design, adopt toughened glass, high transparent material and polycrystalline pure parabolic micro-prism pattern reflection materials, making use of the LED light physical parallel light even reflection in structural design , through the built-in professional design angle reflector, the light reflect to the lighting mirror, and then micro-prism structure mask on the lighting surface the light fully refraction to the lighting space. As for the lighting design, non glare, no ghosting, avoid dazzling from light source brightness, comprehensive restrictions on the brightness of the lamps surface, the surface brightness distribution is even, soft, and spatial layout is very flexible, and can be freely positioning lamps. Completely eliminate glare, create a comfortable lighting environment, reduce stress, reduce errors, improving eye visual comfort. That is non-glare lighting in the true sense, bring people new and comfortable feeling. This lighting fixture is ideal for higher requirement lighting comfort places, such as offices, conference rooms, reception rooms, hospitals, banks, supermarkets, squash, home and so on. New developed Local lighting, non-glare LED spotlights, keep with the excellent features above, pay more attention to the competitive price advantage, suitable for extensive use.WSRM---LEDs Lighting is committed to apply innovative technology  on non-glare LED lighting, which provide high luminous efficiency at lower cost, high quality, comfortable light output. The company devote itself to research and develop anti-glare and non glare lighting applications technology since its established, develop and expand lighting products suitable for different light environment requirements in commercial and domestic lighting field , and launch a series of polycrystalline, pure paraboloid ,micro prism, non-glare LED lamps. Based on the patented technology of independent intellectual property rights, let health lighting and optical beauty together, providing a full range of solutions for high standards lighting customers

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