Guest guest Posted February 13, 2007 Report Share Posted February 13, 2007 Hi, A soldering iron makes a substantial magnetic and electric field. whereas cell phones and flourescent ballasts make a lot of noise, in the radio part of the spectrum. (EM smog) Which LED bulbs have " switching modes " ? Some do have rotating colors. I would categorically avoid them. jaime_schunkewitz wrote: > Good question. It's common knowledge that > LEDs themselves are emission free, but what > about the power modules? Many are switching > mode and produce RF. > > And what are damaging frequencies? 60 Hz at a > few mili gauss wipes me out (take a soldering > iron, or transformer for instance) - just as > damaging as a cell phone or fluorescent lights. > > Eli > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted February 14, 2007 Report Share Posted February 14, 2007 > They DO put out radiation, and make me everybit as ill as compact > fluorescents and sometimes more so than the regular ones. Still, they are completely different technology than compact florescent bulbs, and we've already noted that they have different characteristics when taking meter readings, and at least some people here do not react to them when they did react to compact florescents. Also, it appears from recent postings that it may make a difference in who manufactures the bulb, as differences in the electronics driving the LEDs may be the difference between having symptoms and not. (I suppose people should state who the manufacturer is when saying that they do or do not have symptoms from a particular LED bulb) Marc Quote Link to comment Share on other sites More sharing options...
Guest guest Posted February 15, 2007 Report Share Posted February 15, 2007 That is a bummer. The LED bulbs I was referring to, are here on Ebay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem & category=16037 & item=320072054014 I guess I shouldn't be surprised they are not all of a similar design. Marc wrote: >> They DO put out radiation, and make me everybit as ill as compact >> fluorescents and sometimes more so than the regular ones. >> > > Still, they are completely different technology than compact > florescent bulbs, and we've already noted that they have different > characteristics when taking meter readings, and at least some > people here do not react to them when they did react to > compact florescents. > > Also, it appears from recent postings that it may make a difference > in who manufactures the bulb, as differences in the electronics > driving the LEDs may be the difference between having symptoms > and not. (I suppose people should state who the manufacturer > is when saying that they do or do not have symptoms from a > particular LED bulb) > > Marc > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted February 15, 2007 Report Share Posted February 15, 2007 Before you get too bummed, realize that what Shoeshoe is pointing out may or may not be an issue for you, and what she is calling " fluorescent " is dramatically different in concept and operation from the flourescent lamps you are familiar with. Regular (tube-style) and compact fluorescent bulbs are mercury vapor discharge lamps with a phosphorescent powder coating on the inside of the glass. There are numerous things about most fluorescent bulbs that cause radiated electromagnetic fields. - the electrical discharge itself through the long bulb - the electronic ballast (now usually switching-style) which generates a lot of " electrical noise " - RF noise generated by the arc inside the bulb - magnetic field radiated by the transformers in the ballast circuitry - in addition to these sources of EMFs, most fluorescent lamps " flicker " rapidly NONE of these applies to LEDs. Assuming a manufacturer doesn't " mess it up " by using a switch-mode or transformer power conversion circuit, there is NO measurable electromagnetic field (EMF) from an LED other than the spectrum of the light itself. What shoeshoe is pointing out is that some LEDs (and ones likely to be found in white colored LEDs) use phosphors which absorb and re- radiate the light from the LED junction at a different wavelength in order to produce a more pleasing color of light. It is this use of phosphors that I assume she is calling " fluorescent " . Shoeshoe, please correct me if I'm wrong about your meaning. This use of phosphors in LEDs does not in any way change the LEDs to output a higher electric or magnetic field, but it does produce a different " light spectrum " . Some people (like Shoeshoe) are apparently sensitive to the spectra produced by phosphorescent materials, and have a reaction to them. This certainly doesn't appear to apply to everyone that is ES, and maybe not even to most -- as far as I can tell, I am sensitive to the EMF field and noise produced by the ballast and discharge of typical fluorescent lamps, but although I find some of the spectra of some LED lamps " not pleasing " , I can't detect any electrical sensitivity to the fluorescent LEDs. It may be you just need to try it. There are clearly some people who appear to be bothered by halogen lights, which (without a ballast) produce no measurable EMF either. Garth On Feb 15, 2007, at 9:42 AM, S. son wrote: > That is a bummer. > > The LED bulbs I was referring to, are here on Ebay: > http://cgi.ebay.com/ws/eBayISAPI.dll? > ViewItem & category=16037 & item=320072054014 > > I guess I shouldn't be surprised they are not all of a similar design. > > > > Marc wrote: >>> They DO put out radiation, and make me everybit as ill as compact >>> fluorescents and sometimes more so than the regular ones. >>> >> >> Still, they are completely different technology than compact >> florescent bulbs, and we've already noted that they have different >> characteristics when taking meter readings, and at least some >> people here do not react to them when they did react to >> compact florescents. >> >> Also, it appears from recent postings that it may make a difference >> in who manufactures the bulb, as differences in the electronics >> driving the LEDs may be the difference between having symptoms >> and not. (I suppose people should state who the manufacturer >> is when saying that they do or do not have symptoms from a >> particular LED bulb) >> >> Marc >> > > > > > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted February 15, 2007 Report Share Posted February 15, 2007 > NONE of these applies to LEDs. Assuming a manufacturer doesn't > " mess it up " by using a switch-mode or transformer power conversion > circuit I wonder if there is any way to tell if an LED bulb is using any RF generating components (in advance, without buying it and testing it) ? For example, some LED bulbs advertise themselves as being " dimmable " , while others say that they are not dimmable. Does this tell us anything useful? Marc Quote Link to comment Share on other sites More sharing options...
Guest guest Posted February 18, 2007 Report Share Posted February 18, 2007 > http://www.worldchanging.com/archives/003669.html > " It is also imporant to understand that the quantum dot stuff is just > another fluorescent material, put on top of a short-wave LED. " Also, you should note that LED lighting is still in its infancy, and there are all sorts of ways still being considered to make the color of the light more pleasing. The Quantum dots you are referring to are a recent discovery, and have not yet been incorporated into any commercial products. So again, we probably need to pay close attention to the technology used in specific products, as one may cause ES problems, while another may not... Marc Quote Link to comment Share on other sites More sharing options...
Guest guest Posted August 5, 2007 Report Share Posted August 5, 2007 SArjuna@... wrote: > Marc said that LED bulbs put out radiation. (Some time back. I am > working on catchup.) Dr. Magda Havas says they do not create any harmful > frequencies whatsoever. > Marc, please tell us what frequencies you metered, using what meter. I'm not sure what post you are referring to, especially as you say it was some time back. I know that the issue of LED bulbs is not so clear cut, as one can power LED bulbs with different types of power supplies, and some of these might be okay, and some might not. Also, I have commented that replacing a florescent backlight on a computer monitor with an LED backlight may also not produce much improvement if someone is reacting to other aspects of the monitor. Personally, I have only tried one LED light bulb in our house, and it didn't seem to bother me at all. Unfortunately, it was also pretty dim, and did not produce much usable light. Marc Quote Link to comment Share on other sites More sharing options...
Guest guest Posted August 6, 2007 Report Share Posted August 6, 2007 I have an LED spotlight and it does not put out RF according to the AM radio test. It will not light up even a small room but is acceptable for reading and does render colors well. I think it's 1.5 watts. Bill On 8/5/07, Marc <marc@...> wrote: > > SArjuna@... <SArjuna%40aol.com> wrote: > > Marc said that LED bulbs put out radiation. (Some time back. I am > > working on catchup.) Dr. Magda Havas says they do not create any harmful > > > frequencies whatsoever. > > Marc, please tell us what frequencies you metered, using what meter. > > I'm not sure what post you are referring to, especially as you say it > was some time back. I know that the issue of LED bulbs is not so > clear cut, as one can power LED bulbs with different types of power > supplies, and some of these might be okay, and some might not. Also, > I have commented that replacing a florescent backlight on a computer > monitor with an LED backlight may also not produce much improvement > if someone is reacting to other aspects of the monitor. > > Personally, I have only tried one LED light bulb in our house, and > it didn't seem to bother me at all. Unfortunately, it was also > pretty dim, and did not produce much usable light. > > Marc > > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted January 7, 2009 Report Share Posted January 7, 2009 > are you sure that LED ones don't produce any EMF ? > Have you any technical documentation ? Well, anything electrical puts out some EMF -- even incandescent lights can cause an ES person problems. And certainly there will be LED lights that will cause people problems, as some of them will use transformers or other electronics that cause people problems. But it has already been reported here that there are some LED light designs which do not emit significant amounts of RF noise, so I suspect that when LED lights become more popular, we will be able to identify some manufacturers who make bulbs that are okay. But in the meantime, use incandescents! Marc Quote Link to comment Share on other sites More sharing options...
Guest guest Posted January 7, 2009 Report Share Posted January 7, 2009 giorgio wrote: > are you sure that LED ones don't produce any EMF ? > Have you any technical documentation ? > Hi Giorgio, The closest thing I have to technical documentation is this: My research on one type of LED bulb by holding 2 meters at it and taking a picture :-) http://seahorseCorral.org/images/emf/20090107_led_bulb_meters_1931-800.jpg I am sure this one gives off zero EMF. It has no brand name, and is from China, (but what isn't). It looks the same as the " VIVID LED Light Bulb " at the C.Crane link Marc posted yesterday. 2nd row down from the top. 18 LEDs, 31 Lumens, 1 watt. Only difference is I got some for $7 each after shipping 2 1/2 years ago on eBay. Only regret, was the blue tint might not be ideal, and it is not quite adequate to read by. Quote Link to comment Share on other sites More sharing options...
Guest guest Posted January 21, 2009 Report Share Posted January 21, 2009 > it's strange, my eyes really start to really hurt after a few minutes > with my the new LED Macbook Pro= Hmmm, well maybe LED backlit computer monitors aren't going to be as good as I had hoped... hurting eyes isn't really a symptom I associate with ES, however... Marc Quote Link to comment Share on other sites More sharing options...
Guest guest Posted January 21, 2009 Report Share Posted January 21, 2009 > Double damn. I was really excited when I started to see the first > reasonably priced LED monitors become available. Perhaps this is > specific to the Macbook Pro? " Eyes Hurting " could be eyestrain due to the resolution, or some other non-ES reaction (?). Apple now has an LED backlit cinema display, although Apple monitors tend to have inadequately shielded video cables (and combining the video signal with the power in the same cable? that must be a no-no...) I'm actually quite surprised how well I'm doing with florescent backlit LCD monitors these days -- I used to avoid these, but last year I replaced every CRT television and computer monitor I was using with with these. Marc Quote Link to comment Share on other sites More sharing options...
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