XPost: alt.home.repair, uk.d-i-y
From: Gothberg"@internet.co.is
On Tue, 25 Dec 2018 21:00:53 -0000, Rod Speed wrote:
>
>
> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message
> news:op.zulf8qz8o5piw3@desktop-ga2mpl8.lan...
>> On Tue, 25 Dec 2018 18:33:27 -0000, Rod Speed
>> wrote:
>>
>>>
>>>
>>> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message
>>> news:op.zulb102po5piw3@desktop-ga2mpl8.lan...
>>>> On Tue, 25 Dec 2018 17:33:52 -0000, Rod Speed
>>>> wrote:
>>>>
>>>>>
>>>>>
>>>>> "William Gothberg" <"William Gothberg"@internet.co.is> wrote in message
>>>>> news:op.zukr2cpgo5piw3@desktop-ga2mpl8.lan...
>>>>>> On Thu, 20 Dec 2018 04:22:39 -0000, Clare Snyder
>>>>>> wrote:
>>>>>>
>>>>>>> On Wed, 19 Dec 2018 19:36:51 -0000, "William Gothberg" <"William
>>>>>>> Gothberg"@internet.co.is> wrote:
>>>>>>>
>>>>>>>> On Wed, 19 Dec 2018 17:47:17 -0000, trader_4
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> On Wednesday, December 19, 2018 at 11:35:06 AM UTC-5, William
>>>>>>>>> Gothberg
>>>>>>>>> wrote:
>>>>>>>>>> On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>> > On 12/19/18 6:01 AM, William Gothberg wrote:
>>>>>>>>>> >
>>>>>>>>>> > [snip]
>>>>>>>>>> >
>>>>>>>>>> >> They probably are fairly crude. I know they flicker, for
>>>>>>>>>> >> example
>>>>>>>>>> >> if I
>>>>>>>>>> >> use my cordless drill, the chuck appears to spin the wrong way
>>>>>>>>>> >> under the
>>>>>>>>>> >> LED lighting.
>>>>>>>>>> > I remember seeing that with a washing machine (under fluorescent
>>>>>>>>>> > lights). As the tub was slowing down, the row of holes around
>>>>>>>>>> > the
>>>>>>>>>> > tub
>>>>>>>>>> > would appear to reverse direction. Same thing with (spoked)
>>>>>>>>>> > wagon
>>>>>>>>>> > wheels
>>>>>>>>>> > in movies.
>>>>>>>>>>
>>>>>>>>>> It looks absolutely ridiculous with modern cars with LED
>>>>>>>>>> headlights
>>>>>>>>>> in
>>>>>>>>>> films. How hard can it be to put a smoothing capacitor on the
>>>>>>>>>> output
>>>>>>>>>> of the power supply?
>>>>>>>>>
>>>>>>>>> I've never noticed that. Any films come to mind?
>>>>>>>>
>>>>>>>> A lot of Top Gear programs showing the DRLs of cars fitted with
>>>>>>>> LEDs.
>>>>>>>> With a feature film, they might take the time/trouble/money to do
>>>>>>>> something to stop it.
>>>>>>>>
>>>>>>>>> It seems especially
>>>>>>>>> weird, since cars have a 12V supply with a big battery to smooth
>>>>>>>>> anything out. I guess the power supply that reduces that to
>>>>>>>>> whatever
>>>>>>>>> the LED headlights use though might have a switching power supply
>>>>>>>>> these
>>>>>>>>> days too.
>>>>>>>>
>>>>>>>> AFAIK it's deliberate, making the LEDs operate brighter than they
>>>>>>>> are
>>>>>>>> capable of, but only 1/4 of the time. Our eyes just see the
>>>>>>>> brightest
>>>>>>>> part of the cycle, so we think they're four times brighter than the
>>>>>>>> LED
>>>>>>>> is really capable of, without overheating itself.
>>>>>>>
>>>>>>> That is PWM Overdrive. Peak junction current is over the nominal
>>>>>>> rating, but the average power consumption is below nominalmaximum
>>>>>>> current - and the peak lumen output is significantly enhanced without
>>>>>>> reducing the junction life appreciably.
>>>>>>> THIS would definitely cause flicker as there is a "significant" dead
>>>>>>> period between the "strobe flashes"
>>>>>
>>>>>> Agreed, although Rod thinks only freaks can see it.
>>>>>
>>>>> Its true with car lights.
>>>>
>>>> You're obviously wrong,
>>>
>>> We'll see...
>>>
>>>> just by the number of articles on the internet about it.
>>>
>>> That's just the freaks howling about seeing it.
>>
>> If it were a small number of freaks, there wouldn't so many articles and
>> studies into it.
>
> Bullshit.
Tell me, out of interest, when you watch TV at the usual (before HD) 25fps
interlaced, can you see that it's made up of seperate images? Can you notice
that a moving object jumps a few inches at a time across the screen?
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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