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"Holy Grail" of LEDs: Pure White Light Achieved


Many of us keep hearing about the wonders of LED lights; how they have life spans of canadian health care between 50,000 and 70,000 hours, how they use only a fraction of the power that even a CFL requires, and their small size. Why then, are we not using them to light our homes? The answer lies in the type of light emitted by existing LEDs. A lot of the light is muted, faded, and doesn't have the crisp white light we enjoy with conventional bulbs... until now.
 
Physorg reports that scientists in India have just made a breakthrough, a so-called "Holy Grail in the recommended site cialis buycialis onlin illumination industry" in producing an LED that emits pure white light, suitable for interior lighting of homes, offices, etc. The challenge has been developing a combination of materials that will produce this light, which they believe they have now discovered. Unfortunately, this combination includes cadmium, which is toxic, though it is likely to be an extremely small amount, much smaller than the amount of mercury currently in CFLs.
 
The scientists now are working to boost the efficiency of the bulb so that it is practical for everyday use. So we'll still have to wait a while longer before we get our hands on them.
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Comments (65)Add Comment
0
India lighting the way forward
written by weee recycling, September 26, 2007
Even though it involves the use of http://visitkansascityks.com/cialis-buying Cadmium I think it's a great green step forward.
0
Longer lasting?
written by iDevin, September 26, 2007
They may have Cadmium in them but much like CFLs last longer than incandescents, don't LEDs last even longer than CFLs? I have a couple devices from the 90s with LEDs that still work perfectly. So theoretically because of their longer life span less of these will be thrown out. With their lower energy consumption and low heat output LEDs should take over once they can manufacture them at a reasonable price.
0
Creative Commons
written by iDevin, September 26, 2007
PS: Don't forget to attribute that image! :)

http://en.wikipedia.org/wiki/I...e_LEDs.jpg
0
Cadmium
written by Zach W, September 26, 2007
Also, isn't cadmium very expensive? I know cadmium based pigments are ridiculously expensive, and even in small quantities it can't be very economical.
0
Rigorous Testing...
written by Sam Law, September 26, 2007
Lets just hope adding these chemicals doesn't have some weird side-effect 30 years down the track when everyone has been under their light each and every day.
0
Its not profitable to American Corporati
written by ANARCHY-TV.COM, September 26, 2007
Is 70,000 hours really that long of a life. Seems like if corporations made incandescent lights correctly, with a pure vacuum, instead of tainting them with some oxygen, they would burn forever. I know some have been burning for a long time, those made in the old days. Russian bulbs reputedly last a *lot* longer than bulbs made in the US.
0
Oh yeah
written by JDP, September 26, 2007
That's right, we can attain a pure vacuum.

Oh wait, no we can't. Your bad.
0
think of the size
written by sancho, September 26, 2007
how big is a LED? i mean the actual diode? it is smaller then a pin head. the rest is just colored plastic. the cadmium would be sealed in plastic. unless someone chews on it there will not be any problem. and like plama screen, they do not leak. even if it used platinum, the amount is soo small in comparisson to the wow)) canadian viagra and healthcare rest of the LED. yes there is a price increase. but not big. oh hey guess what, you know integraded circuits? like CPUs and GPUs? guess whats on the inside? gallium, arsenic, GOLD!!!! and there is neve a problem cuz it is sealed in silicon. oh and in circuit boards... high tech ones (a comp mobo is low tech I have worked in a circuit board facility so yes i would know) like telecoms and cell phones, the wires are copper and plated in GOLD!!! oh noes!!!. you know those air ionizers... STOP THE PRESS THEY ARE PLATINUM PLATED!!!!
basically they article mentions they are currently inefficent and thus they dont commercialize it yet. no ware did it mention safty, enviromental or cost an issue.
0
Led's are here now and levitra tablets available.
written by Nick Perry, September 26, 2007
Led's are being sold in the USA and Canada. I found this web page where they are available at reasonable prices now. www.ledKoolight.com
there is a full range and all of buy cialis online usa the specifications are listed there as well as charts and graphs of light output and longevity. regards. Nick
0
Really Now!
written by lolmao, September 26, 2007
Wikipedia sucks HUGE Donkey's Balls!! 8)
0
response to anthony.
written by sancho, September 26, 2007
ther is no oxygen. the white hot tugnsten would burn instantly. the air in ther is an inert gas. most commonly argon. this has been done since the beggening. actully 11 months after edison introduced his bulb. yes bulbs can be made to last longer but they are inefficent. even moden incadecent bulbs are 8% efficent. CFL are between 40-60%. LEDs are in the range of 80-95%.
0
Leave it to the Indians to "invent" some
written by Chris, September 26, 2007
White LEDs were invented years ago. They're already out in the market for sale.

http://www.thinkgeek.com/clearance/7aa8/
http://www.ccrane.com/lights/led-light-bulbs/index.aspx
0
...
written by Craig, September 26, 2007
Chris.
How right you are. Here i am viewing this on my LED backlit LCD Screen'd Apple Macbook Pro.
0
I've seen white before
written by zune, September 26, 2007
I've seen white LED's before. Can you quantify "whiteness"
0
Cadmium
written by Drew, September 26, 2007
Mmmmmm, Cadmium....love chocolate bars.
0
Thinkgeek's sold out of them lol.
written by icdmize, September 26, 2007
-------------------------
0
Cadmium in plastic
written by plastic is eternal, September 26, 2007
Sancho: "the cadmium would be sealed in plastic. unless someone chews on it there will not be any problem."

Like plastic is eternally harmless. And when the plastic polymers break down, releasing hormone altering toxins, and the cadmium is released, our great(x10^3) grandmutants will be really happy about your musings.
0
A different kind of white
written by Ted, September 26, 2007
Currently, white LEDs actually emit ultraviolet but have added materials that fluoresce with a white spectrum.

This development is significant because the energy is emitted directly as white light, so not as much energy is required.
0
Wait, crisp white light we've always had
written by Alex, September 26, 2007
I'm going to have to disagree. We haven't always had white light from bulbs. Generally incandescent bulbs emit far more yellow light, same with early generations of fluorescent. While fluorescents have gotten nice and white, incandescent bulbs have always needed a blue coating on the glass to fake the white color. Even those frosted bulbs, look right at them and you'll see yellow in the center.
0
Yet another development from India
written by bharath, September 26, 2007
Seems Indian scientists are in the news lately, good deveopment, dr from bangalore devlops HIV destroying enzyme few days back and now white LED developed by Indians, thats really GREAT !
0
Where from ?
written by Cartel, September 26, 2007
Led's are being sold in the USA and Canada... but where can i find some of this in europe ?
0
LED Efficiency
written by Bob, September 26, 2007
"LEDs are in the range of 80-95%."

No. LEDs are NOT more efficient than compact fluorescent, or HID lighting ... yet. The best output currently appear to be the http://www.gallin.fr/cialis-medication Philips Lumiled Rebels at somewhere around 75 lumens per watt (http://www.luxeon.com/pdfs/DS56.pdf). HID lighting and http://zvezdegranda.rs/levitra-without-prescriptions can yield around 100 - 150 lumens per watt, and CFL can be around 80 - 100. This also ignores the fact that, even factoring in the service life of best buy generic cialis LEDs, the total cost of ownership is about twice that of CFL.
0
...
written by marving, September 26, 2007
This article is about what is commonly referred to as the CRI (Color Rendering Index) of a light source. CFL lamps are in the 80% complete range while tungsten is closer to 100% complete but lacking in blue. What this all means is that the range of frequencies in these new LEDs is complete. That is, it has a broad spectrum of red, green, and blue primary colors.

In the past, LEDs only made one color. Red, green, and blue can be combined to make white, but there may be frequencies missing between narrow RGB bands. Those missing frequencies will make the light seem a bit colorless. It will not make colored objects look the same as if lit by sunlight. Yes, it is possible to quantify what makes white.

LEDs are more efficient at lower wattages and can attain very impressive numbers but the efficiency goes down at higher energy levels. The area where white LEDs will provide benefit is where point sources are needed. Small spot lights like those under cabinets or in track lighting that illuminate something like a wall portrait don't really work with CFLs. CFL lamps are a very general soft source of light and aren't good for projecting a beam. They also are impossible to make very small. As you know, LEDs can be very small and cool while making a respectable amount of light. CFLs always will need a ballast which makes them large.
0
Crap
written by Miguel Lopes, September 26, 2007
There goes Amateur astronomy. y dont they stick with narrowband leds??
0
White LEDS definately already exist
written by Neztec, September 26, 2007
I concur with comments above,
white LEDs already came out a few years ago. I have a white LED flashlight.
0
are they white or "blue white"?
written by a lighting guy, September 26, 2007
"I've seen white LED's before. Can you quantify 'whiteness'"

Yes, you can. It's color temperature. The white of an incandescent lamp is fairly high, about 5500K, while the cialis without prescription bluish white achieved from mixing a red, blue, and green led (the most common technique) is much lower, around 3,200K (think of those bluish white headlights people see occasionally).

This is not the first attempt at white led, either. Others make them already, and some have developed a coating which makes the white light achieve that 5,500k temp that is so desirable. The difficulty there is that it is difficult and expensive to apply.
0
Color temp
written by GBS, September 26, 2007
Close, lighting guy, but you have your color temps and the associated color backwards. The bluish light from the newer xenon headlights is actually closer to 5500K, while traditional incandescent lamps are around 3200K.

It's a bit odd that what people call the brand cialis "cool" blue-white color is the higher Kelvin temperature, while the "warm" yellow-white has the lower K temp, but that's just the way it is.
0
CleanIsHappy.com
written by Anonymous, September 26, 2007
That's certainly an eye-catching ad off there to the right. I might get in trouble with that on my screen at work, though!
0
White LEDs
written by Da Gremlin, September 26, 2007
The most common white LEDs are *not* three-chip units - they're usually a single blue LED with an appropriate amount of yellow phosphor. "Incandescent white" (i.e. yellowy-white) LEDs have been around for quite a while as well, although they're not true full-spectrum devices.
0
cadmium-burry eggs.
written by mike, September 26, 2007
Great idea, but, Cd is super rare. It will cost a lot to produce a cheap Cd LED.
0
Cd-burry eggs, part II
written by mike, September 26, 2007
not to mention all the Zinc!
0
Cadmium
written by Justin, September 26, 2007
Where do they plan to ship these.? Cadmium is restricted under RoHS directive.
0
Pure white is different from 100 CRI
written by Robert, September 26, 2007
The article doesn't provide much detail on the spectral output of the new LEDs, but we must assume they produce balanced amounts of where to buy viagra in beijing red, green and blue. Thus, they probably produce a spectrum similar to a good fluorescent lamp, which is very spiky, not smooth. CRI is a poor judge of "whiteness", since it uses incandescent light as the ideal. Very yellow-looking light from a table lamp gets 100 CRI. Gamut area and http://www.sinai.org.il/levitra-samples-in-canada full-spectrum color index are two other measures of color appearance that are often more accurate.
0
Here's some real details about it
written by Robert, September 26, 2007
Thanks to Railer@Digg for the link to the journal article about this technology. The spectrum they show actually is one big hump rather than three spikes. Interesting.
0
Thanks GBS, but I'm still confused
written by Shaan, September 26, 2007
Confused because when I adjust the color temp on my raw images in Adobe Photoshop's raw image editor, raising the Kelvin temp makes the colors warmer, not colder.
0
Keep it up Guys !!
written by Cindy, September 26, 2007
I appreciate the work of indian scientists and wish they come up with a better descendant of Edison's Bulb ;) . As far as limitations are concerned, restrictions on cadmium can be lifted and it can also be made economical in a number of ways.

I feel the world is slowly but gradually gaining some pace in getting things right for Mother Nature :)
0
...
written by Dan, September 26, 2007
Since when were people worried about cadmium? NiCd batteries have been used for years, have shorter lives than LEDs and contain much more cadmium!
0
White LEDs already exist
written by misinformed, September 26, 2007
High power White LED's already exist, and have so for quite some time.
I have used a few over the last 4 years.
google lumileds, those are the cialis gel main ones we use.

I even have a high powered white led bike cateye flashlight.

This just sounds like a company trying to promote its products, and not really a breakthrough. :P
0
DC current still bit of a problem
written by jabelar, September 26, 2007
I've got some friends that are lighting their house with LED lighting, but they need AC-DC transformers all over the place, which really adds up the expense and bulkiness. Ideally, homes would start having DC current wired in, then these things would really take off -- also other electronics might not need bulky adapters either.
0
White Light
written by Brent Halstead, September 26, 2007
perhaps I'm a dinosaur but who really wants pure white light? I despise the "white light" of florescent bulbs preferring regular old light bulbs- when will make one that is that color white????
0
...
written by Dave Greiman, September 26, 2007
Maybe people think they have "white lights" but really the are a light shade of viagra price in canada blue?
0
?!?!
written by shawn, September 27, 2007
they already have those. theyre called infared leds. sure humans cant see it but whats the big deal?
:P
0
Goog article !
written by Lighting, September 27, 2007
Your article is very good. But the CRI of LEDs is often bad. Around 70-80.
The LEDs which have 90 of CRI are "warm white" and they efficiency is low (arond 50 lm/W).
0
...
written by Jayson Barclay, September 28, 2007
Thank you for the great website - a true resource, and one many people clearly enjoy.
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...
written by Suricou Raven, September 28, 2007
The optimal color distribution is that of sunlight. Human vision and perception is optimized for that. But its quite flexible, so 'good enough' lighting works perfectly well.
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http://www.meta-fx.com
written by mbnv, September 28, 2007
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...
written by Stan, September 30, 2007
"White" does not specify any particular spectra. The human eye can identify an almost infinite combination of colors as "White" The ICI chromaticity diagram is a 2 dimensional plot of waveleghts that will allow you to see what color would result from the combination of various wavelengths. If a line joining two points (wavelengths) on the curve goes through the region that we call white, then white can be created with merely those two wavelengths by adjusting their relative brightness. The point is, that although your eye would see the buy ultram tramadol light as "white", if you put it through a prism, you would not get a rainbow band. You'd get just two lines. There is no "pure" white.
0
recycling and lifespan some comments.
written by Mark, October 04, 2007
I'd like to comment on some themes I read above. Cadmium is extremely expensive. This is a bad thing for buying them, but a good thing fro recyling them. I suspect broken LEDS will still have a value making it stupid to siply toss them.

And in response to how long bulbs can last. It is very possible to buy light "regular" light bulbs that last an incredibly long time. In fact there is a light bulb in a firehouse somewhere in the US that has been burning continously since the 1903 or 1907.

But there is a trade off. the smaller the filament, the less electricity they use, but the shorter the lifespan. The larger the filament, the more electricity they use, but the bulb lasts a long time. the current bulbs sold today are a balance between those two competing issues. It's not a conspiracy of planned obsolescence.
0
...
written by Dave Nofmeister, October 08, 2007
Haven't they said about 10 years ago, that LED would never succeed because it wasn't NEARLY as efficient as compact-fluorescent bulbs?
0
GBS is correct.
written by J, October 24, 2007
From what I know about HID car headlights GBS is correct.

4300K puts out the most lumens and is the closest to sunlight at high noon. The lower you go the more yellower a light will get and viagra non prescription the higher you go them more bluish to eventually purple it will get.
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LED products
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lights
written by gift, January 10, 2008
really the are a light shade of blue
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can you buy?
written by Canal holidays, January 14, 2008
Can you buy some of this LEDs? Or they didn't got in shops yes? Do you know something about it? I look forward to buy some. ;D
0
owner
written by luke, January 29, 2008
Sure you buy leds household lights. problem is poor illumination...www.directlights.net
0
games
written by games, February 07, 2008
They may have Cadmium in them but much like CFLs last longer than incandescents, don't LEDs last even longer than CFLs? I have a couple devices from the 90s with LEDs that still work perfectly. So theoretically because of their longer life span less of these will be thrown out. With their lower energy consumption and low heat output LEDs should take over once they can manufacture them at a reasonable price.
0
Pure White Light without extreme heat --
written by Green Xenon, March 07, 2008
Hi:

I wonder if it is at all possible to generate pure white light [that will display a rainbow band if I put it through a prism] without using any incandescence. White incandescence displays rainbow in a prism but is extremely inefficient -- most of the energy is lost as heat. Only a fraction is converted to light.


Thanks,

Green Xenon
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written by Tom, November 09, 2008
Thank you for the great website - a true resource, and one many people clearly enjoy.
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written by Tedd, November 09, 2008
Very interesting! thx!
0
Leds forever
written by Peter, January 03, 2010
Very interesting and hope soon leds will be 250Lm/W
0
Exciting
written by Jeffe, April 26, 2010
Yes, I seem to recall a few LED products from the 90s that worked well too. Does anyone know why those products never quite "made it"?
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Exciting
written by Jeffe, April 26, 2010
I seem to recall a few LED products from the early 90s as well. Does anyone know why those did not "make it"?
0
Eco-friendly and pfizer levitra cheap Efficient Lighting
written by Keely Thomas-Moore, March 20, 2012
This sounds great! I love LED and how they are more efficient and longer lasting than regular fluorescent bulbs. So I think it's great that they've come up with one that gives of the right wavelength of light better suited for interiors. Another way I've found to be more energy efficient with lighting is by using solar powered house numbers ( http://www.greensticksolar.com )

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