http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/ Engadget Comments for Researchers tout advances in development of pure white LEDs http://www.engadget.com/media/feedlogo.gif http://www.engadget.com en-us Copyright 2012 Weblogs, Inc. The contents of this feed are available for non-commercial use only. Blogsmith http://www.blogsmith.com/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
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]]>Jul 17th 2009 1:35AMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/Sep 26th 2007 3:57PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
I saw a 9W for only 30 € it replaces the halogen 50W.

I saw them in some places and look well. 400 lumens]]>Sep 27th 2007 7:47AMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/Yes, a bulb will have the step down inside the bulb enclosure, and would be disconnected when the light socket is off, but when on, isn't the transformer wasting "juice" in the step down process? ]]>Sep 26th 2007 4:10PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
Second, depending on the LED voltage drop, you technically do not need a transformer at all. Granted, it can get stupid sometimes, but if you had an LED with a 3V drop, then if you wired 40 in parallel 40*3=120V. Bingo, no transformer needed.

Also, technically, you don't need a rectifier either, depending on the LED response time. You might be able to see the 60hz flicker out of the corner of your eye, but probably not.]]>Sep 26th 2007 4:17PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/Sep 26th 2007 4:31PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
Sources:
http://www.apple.com/environment/resources/specs.html
http://www.treehugger.com/files/2007/02/led_bulb_replac.php
http://en.wikipedia.org/wiki/Compact_fluorescent_lamp]]>Sep 26th 2007 4:32PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
in ideal theory, a transformer does not consume energy and only converts energy. in the non-ideal and realistic world, transformers operate with >95% efficiency and emit only a tiny amount of heat compared to the amount of power they convert. if nothing is even consuming power, a realistic real-world transformer consumes only a small fraction of a watt.

just to show you the math, if a plugged but unused wallwart is emitting 0.5W of heat (a very realistic number), unplugging the wallwart for 24 hours saves the same amount of energy as an average single electric stove plate consumes in 30 seconds, or that a car consumes in less than a second.

hence, don't be penny-wise and pound-foolish; there are better ways to save energy than unplugging wallwarts.
]]>Sep 26th 2007 5:05PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/only 0.5W you say? that's per brick, so assuming only half the population of NZ has cell phones and they all leave the brick in the socket cause hey, what's half a watt per day, and that's like 2,000,000 people. so we're only wasting 1,000,000 W per day... peanuts]]>Sep 26th 2007 8:22PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/Oh, and I have NEVER touch the stuff...]]>Sep 26th 2007 4:24PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
@ Staniel, you mean 40 in series (not parallel to get a 120V drop.

LED's are the energy efficient solution we need. Fluorescents are not good, too much mercury.]]>Sep 26th 2007 4:32PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
It's a very tiny amount, particularly compared to the amount of mercury that's emitted by a coal power plant that might be use to light the bulb over its entire life.

LED would be nice, I'd like to see it get affordable, and I hope there's enough surge protection built into them, because I'd hate to buy $100 LED bulbs and have them zapped by lightning.]]>Sep 27th 2007 1:47AMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://pubs.acs.org/cgi-bin/sample.cgi/jpccck/2007/111/i37/pdf/jp074703f.pdf

The people making the claim that it's 'closer to the "Holy Grail of the illumination industry."' are the people over at PhysOrg. The actual primary source, the technical letter is a lot more modest.]]>Sep 26th 2007 4:31PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/]]>Sep 26th 2007 4:37PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
Oh, it's the Indian Institute of Science?

Nevermind.]]>Sep 26th 2007 4:44PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
http://www.cree.com/press/press_detail.asp?i=1189169857943]]>Sep 26th 2007 4:53PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/Sep 28th 2007 5:03PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/Sep 26th 2007 8:59PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/your insignificant 0.5W * the number of people who think it's ok to waste power as long as it's only a little = A_HUGE_EFFING_NUMBER W
if we can save 1 million watts by driving for a second less each day, why not unplug your unused phone charger and save 2 million?
it's not ok to waste power, full stop]]>Sep 28th 2007 2:08AMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/
@Maverickfiveo - Cadmium is on the RoHS list, but cadmium selenide is not. Nanocrystalline - or, more appropriately, nanoparticulate - CdSe is what we call a quantum dot; particles much less than 100nm in size start to exhibit interesting quantum effects. In the case of quantum dots, all light below a certain wavelength is absorbed and re-emitted at one particular wavelength, which is tuned by changing the size of the quantum dot.]]>Sep 26th 2007 10:58PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/I say they just need to get used to it and they must think of the children and the fact I've reduced the watt consumption in the kitchen from 550 to 11.
I 'm keeping it to myself that I hate the light as well.]]>Sep 27th 2007 5:05AMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/Sep 28th 2007 4:48PMhttp://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/http://www.engadget.com/2007/09/26/researchers-tout-advances-in-development-of-pure-white-leds/Jan 4th 2008 12:13PM