[Elecraft] OT: LED Light Bulbs

[Dave Cole (NK7Z)]

Currently Dollar Tree has a set of 60W sunbeam LED lights on sale for a 
buck each, and they are dead quiet.  I bought 20 of them today, and 
swapped out every light in the house.  Lost about half an S unit of noise.

73s and thanks,
Dave
NK7Z
http://www.nk7z.net

On 10/23/2017 05:07 PM, Kevin Stover, AC0H wrote:
> Maybe I'm just lucky.
> Over the last two years I changed out all the incandescent and CFL bulbs 
> in this house save two. They are the two 150W Halogen lights I have to 
> illuminate the garage/driveway/deck if someone gets too close to the 
> house at night.
> 
> No RFI detected on a K3 or a K2.
> 
> On 10/21/2017 11:51 AM, Bob McGraw K4TAX wrote:
>> One thing observed at our repeater location is that the CFL was quiet 
>> until the the transmitter was on the air. It then generated noise.  In 
>> a simplex condition it wouldn't be observed. But in a duplex operation 
>> or multiple receiver situation it becomes an issue.  Replaced by a LED 
>> with lessened issues.
>>
>> Bob, K4TAX
>>
>>
>> Sent from my iPhone
>>
>>> On Oct 21, 2017, at 11:21 AM, Jim - N4ST <Hamshack at N4ST.com> wrote:
>>>
>>> I have noticed the background noise level growing on the HF bands, 
>>> and for me, especially on 18 Mhz.  I need to declare war on RFI and 
>>> find out what is causing this.  I did carefully checkout some Walmart 
>>> "100 W" LED lights before committing to them and they were fine.
>>>
>>>
>>> _________
>>>
>>> 73,
>>>
>>> Jim - N4ST
>>>
>>> -----Original Message-----
>>> From: elecraft-bounces at mailman.qth.net 
>>> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bob McGraw K4TAX
>>> Sent: Saturday, October 21, 2017 11:32
>>> To: elecraft at mailman.qth.net
>>> Subject: Re: [Elecraft] OT: LED Light Bulbs
>>>
>>> Makes me wonder if at all or how frequently production lots are 
>>> evaluated to determine if they are in FCC Part 15 compliance.
>>>
>>> Otherwise, the approach "we evaluated one production lot, deemed it 
>>> passed" {a.k.a - I saw it work once, ship it}  and then produced a 
>>> million or so afterwards including those with some engineering 
>>> changes and cost down changes.
>>>
>>> Guess I need to power the radio from the tractor battery and dump the 
>>> main breaker in the house to see how much the noise changes.
>>>
>>> 73
>>>
>>> Bob, K4TAX
>>>
>>>
>>>
>>> On 10/21/2017 9:48 AM, w4sc wrote:
>>>
>>>> An observation:
>>>
>>>>
>>>
>>>> I too had RFI from LED lights, but the interference was to OTA 
>>>> television, Channel 10 (192-198 MHz) DTV.
>>>
>>>>
>>>
>>>> Not all LED bulbs are created equal in this regard, RFI reduction / 
>>>> elimination.  The RFI was generated in this case by the SMPS 
>>>> integral to the bulb.
>>>
>>>>
>>>
>>>> The offending bulb is Utilitech part # 5DG6 (printed on the bulb) 
>>>> and is ‘C  UL  US’ listed, purchased from LOWEs.
>>>
>>>>
>>>
>>>> I have a overhead fixture that was populated with four 800 lumen 
>>>> (60w?) bulbs, 2 being Utilitech, and 2 Sylvania OSRAM.
>>>
>>>>
>>>
>>>> By removing the bulbs and observing channel 10 reception, the 
>>>> offending bulb was determined to be the Utilitech.
>>>
>>>>
>>>
>>>> I replaced the the the Utilitech bulbs with Sylvania OSRAM, and the 
>>>> RFI on channel 10 OTA was eliminated.
>>>
>>>>
>>>
>>>> The Sylvania OSRAM part number used is LED8.5A19/DIM/0/827/G5/RP as 
>>>> printed on the box UPC, and were purchased from LOWEs also.
>>>
>>>>
>>>
>>>> NOTE: There may be interference from Sylvania OSRAM bulbs on other 
>>>> frequencies.  LED bulbs are required to meet FCC Part 15 FCC, Class 
>>>> B regulations.
>>>
>>>>
>>>
>>>> YMMV
>>>
>>>>
>>>
>>>> I have not seen a comprehensive report or article that unveils 
>>>> “good” vs “bad” LED bulb manufacturer and part identification as far 
>>>> as RFI emissions across the spectrum.
>>>
>>>>
>>>
>>>> Ben W4SC
>>>
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>>>
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