[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
Tue Oct 11 21:06:46 EDT 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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