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.
>
>> It is a large percentage of the population that can see it.
>
> Easy to claim.
>
>> Way more than the percentage of vegetarians and disabled,
>
> Easy to claim.
>
>> yet they both get catered for.
>
> Because in the case of the disabled, it stops them getting
> around. Being a freak that sees some car lights flicker doesn't.
It causes distraction while driving. Even a fuckwit like yourself should
realise that's a bad thing for everyone.
> In the case of vegetarians, pandering to them sees them
> buy what you are flogging and avoids them going to
> some other place that does pander to their freakishness.
Please at least try to get your negatives right in sentences.
>>>>>> I wonder why none of my houselights use this?
>>>>>
>>>>> Hues bulbs do, you can see that by waving something non
>>>>> transparent past a bulb when looking directly at a lighted bulb.
>>>>>
>>>>> Your strip house lights have far more leds so don't need to.
>>>>>
>>>>>> Do car lights have to make more brightness from a smaller area?
>>>>>
>>>>> Corse they do.
>>>>>
>>>>>> Or would flickery houselights annoy people more?
>>>>>
>>>>> They don't with Hue bulbs.
>>>>
>>>> They don't annoy YOU. They probably annoy others.
>>>
>>> You wont find anyone saying that they annoy them on the net.
>>
>> Depends just how flickery they are. If the frequency is high enough, they
>> won't bother anyone.
>
> I meant that you wont be able to find anyone saying
> that the Hue bulbs annoy them by flickering on the
> net. Philips must have designed them properly.
With a higher frequency above what us superior beings can see.
>> Can you set something up to test the light output (or the voltage to the
>> LEDs) with a scope?
>
> Not easily. The scope probes are hiding
> and the scope is too, even tho its pretty big.
You lost an entire oscilloscope?!
>>>>>> If it's the extra brightness, I don't understand
>>>>>
>>>>> As always.
>>>>>
>>>>>> because I have a torch with a single LED and parabolic reflector that
>>>>>> gives out 20W equivalent without overdrive. Simply have three such
>>>>>> lamps with their own little (only 1.5 inches across) reflector next to
>>>>>> each other to make the headlamp.
>>>>>
>>>>> Even you should have noticed that car headlights are much brighter.
>>>>
>>>> A car headlight SHOULD be 60W equivalent.
>>>
>>> Wrong, as always.
>>
>> Back in the days of incandescent lights on cars, every single car had a
>> 55W/60W bulb for it's headlights.
>
> That's a lie too.
Nope.
>> 55W for dip and 60W for full.
>
>>>> So 6W of LEDs, or a few of my torches per lamp.
>>>
>>> Your torches are lying about them being 20W equivalents.
>>
>> Actually the lie says they're 60W. I measured them as 20W. They consume
>> 2W and give out 20W equivalent.
>
> You don't know that last.
I looked up the specs for the LED it uses. I measured the current it consumes.
>>>> Quite possible to just have three reflectors just like my torch, mounted
>>>> together.
>
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