XPost: alt.home.repair, uk.d-i-y
From: Gothberg"@internet.co.is
On Wed, 19 Dec 2018 21:33:32 -0000, wrote:
> On Wednesday, December 19, 2018 at 11:36:48 AM UTC-5, William Gothberg wrote:
>> On Wed, 19 Dec 2018 16:18:29 -0000, Mark Lloyd wrote:
>>
>> > On 12/19/18 5:23 AM, William Gothberg wrote:
>> >> Do switch mode power supplies flicker in time with mains? Specifically
>> >> LED power supplies in commercially available domestic lamps. By in
>> >> time, I don't mean at the same 50/60Hz, but anchored to it. I.e. if you
>> >> have several such lamps each with their own built in supply, will they
>> >> all flicker in time, using the mains frequency to keep them in time, or
>> >> will they be random, making the room overall not flicker due to them all
>> >> being random? And is there any way I can test this? I tried taking
>> >> photos of them, but my camera only goes as fast as 1/2000th of a second,
>> >> which shows all the lights at the same brightness each time, I suspect
>> >> the flicker is above 2000Hz.
>> >
>> > I once had an audio amplifier with a solar cell rather than a microphone
>> > for the input transducer. This made it possible to listen to light. The
>> > sun is steady, incandescent lights (AC powered) hum.
>> >
>> > That was 40 years ago. Maybe something like that would work today.
>>
>> The trouble is I want to compare 2kHz+ from one light with 2kHz+ from a
neighbouring light and see if they're in sync.
>
> it is very unlikely that they will be in sync.
> mark
Agreed. All I can detect (with my digital camera) is that one brand of LED
light I have flickers about 5 times less (not sure if it's smother or faster)
than the others. It's also the brand that lasts longer, probably better
designed overall.
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