[time-nuts] the end of light bulbs as we know it was Re: Safe power-up. was (Solartron 7075 ...)
John Howell
j at howell61.f9.co.uk
Wed Oct 12 01:06:46 UTC 2011
Sorry Tom, (again!),
Just as significant is the radiation from compact fluorescent lamps, many radiate strongly in the 50-60KHz region from their SMPSs. This has been the reason for failure of several clocks I am aware of that are tuned to radiocode transmissions on 60KHz.
John H.
On 12 Oct 2011, at 01:28, Gerald Molenkamp wrote:
> Hi All,
>
> Sorry Tom, worth a mention.
>
> I replaced all of my down lights after my Kids wanted us to contribute
> to lowering our carbon footprint. On the positive side, moving to LEDs
> will provide savings around $107/year in electricity charges.
>
>
>
> Now to the negative part , noise floor from around 21MHz to well over
> 500MHz raised to a signal strength 5 to 6 across mid to upper HF / lower
> VHF to upper UHF with them switched on, otherwise my noise floor is
> Zero.
>
> Lower VHF to UHF SSB/FM low level signal work is now not possible when
> LEDs are on, mostly at night when we enjoy the hobby.
>
> The net effect of dirty LED lighting has long term issues with sensitive
> receivers.
>
> Regards
>
> Gerald
>
> VK3GJM
>
>
>
>
>
>
> There is one angle that was not covered, but which is relevant (at least
> to those of us using any LF or HF time receivers).
>
> Over the weekend I bought my first LED bulb. It was on sale and I
> wanted to see how it worked. On the package it gave a warning that it
> could interfere with HF communications in the 0.45 - 30 MHz range and to
> not install it near any maritime emergency communications equipment.
>
> Peter
>
>
> On 10/11/2011 6:56 PM, Tom Van Baak wrote:
>> This thread is wonderful, nostalgic, technical, futuristic, and
>> appropriate for someone's list. But not time-nuts. Please stop it now.
>
>> Don't reply.
>>
>> /tvb
>
>
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