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[RFI] LED Floodlight warning!!

To: rfi@contesting.com
Subject: [RFI] LED Floodlight warning!!
From: Steve Kurtzman <sparkie001@dslextreme.com>
Reply-to: sparkie001@pobox.com
Date: Sun, 23 Jan 2011 20:58:34 -0800
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Not to mention that these do not appear to be UL/CSA listed.  As far as 
I know it is illegal to sell these in Canada.

Run away as fast as you can!

Steve W7SJK
> Date: Sun, 23 Jan 2011 03:46:25 -0800 (PST)
> From: Craig<vk3he@yahoo.com>
> Subject: [RFI] LED Floodlight warning!!
> To: rfi@contesting.com
> Message-ID:<301832.98313.qm@web161206.mail.bf1.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
> Hi All
> I  recently purchased this   new LED floodlight which has turned into a RFI 
> nightmare. I just want to warn other hams about the huge amount of 
> interference that these lights cause.
> My warning might also help those looking for interference sources around 
> their neighborhood. LED floodlights are a disaster as big as bad plasma TV 
> sets because the QRM level is so intense.
> These light are becoming popular because they can save you  a lot of money 
> when compared  to running a normal 500 watt floodlight.
> I purchased several of these LED lights from various Ebay sellers. They all 
> seem to originate from the same factory. They have   ratings from 10 to 50 
> watts. These lights are the ones that use a huge  large LED CHIP  rather than 
> discreet individual LEDs
> Here is a link for one on Ebay, if it looks like this light avoid it.
> http://cgi.ebay.com/Lemansind-50W-White-LED-FloodLight-Wall-WashLight-/270694205505?pt=US_Flashlights&hash=item3f06a1c841
> A generic search for "LED floodlight" will show the many seller listings for 
> these lights.
> These light cause S9+20db hash right across the HF spectrum. Its the worst 
> case of switch mode power supply noise that I have ever encountered. What 
> also amazes me is the strength of this hash that could be detected from a 
> long distance away, upto 1km away!
> I emailed the supplier,  and  he  advised me that he has paperwork which 
> certifies the lights with  a C tick compliance. The paperwork is obviously 
> fraudulent or he is just telling lies. Most of the  goods from China have  
> fake EMC compliance documents and certification ..
> When I opened the light, it had a small switch mode power supply module. This 
> module does not appear to have any mains filter or other output filtering. 
> The light is well shielded since the whole assembly is cast  aluminum. The 
> power supply module is well shielded, hence the surprise at the rather high  
> noise levels.
>   I added a IEC filter which did nothing to reduce the noise level. I added 2 
> X Fair-rite FT240-31 ring cores on the power supply lead and this did not 
> help either. I added 2  X #31  material cores onto the DC output and this did 
> help, however the noise was still shocking.
>   I am going to try some capacitor bypassing and perhaps a professional  DC 
> filter. So far the signs are not encouraging. The noise is still very 
> intense. If I dont have luck I will just throw these lights in the bin.
> I have these lights in 10 20 and 50 watts and they all have the same 
> interference levels. Its a real shock to turn on my  SDR receiver and see the 
> waterfall go red(5/9+) from 1mhz to 30mhz!
> Anyway avoid these lights like the  plague!
> 73
> Craig
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