XPost: alt.home.repair, uk.d-i-y   
   From: rod.speed.aaa@gmail.com   
      
   "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.   
      
   >>> 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.   
      
   >>> 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.   
      
   > So 6W of LEDs, or a few of my torches per lamp.   
      
   Your torches are lying about them being 20W equivalents.   
      
   > Quite possible to just have three reflectors just like my torch, mounted   
   > together.   
      
   Yes, but that's nothing like what real headlights produce light wise.   
      
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