[Elecraft] OT: LED Light Bulbs

Tue Oct 24 07:45:01 EDT 2017

3000K.... VERY yellow...  I wouldn't be able to see anything.  I look 
for highest possible...  5000K minimum

73,
Clay

On 10/23/2017 11:36 PM, Dave Cole (NK7Z) wrote:
> Here is the review of these lights...
>
> https://www.youtube.com/watch?v=zJWssuCGkC8
>
>
> 73s and thanks,
> Dave
> NK7Z
> http://www.nk7z.net
>
> On 10/23/2017 09:35 PM, Dave Cole (NK7Z) wrote:
>> 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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>>>>>> rmcgraw at blomand.net
>>>>>
>>>>>
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>>>> ______________________________________________________________
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