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| RJSV:
All this talk about flicker, I can't hold my tongue for long: A mysterious part, of my cluster of neurological symptoms (LYME diagnosis), is a visual 'flicker', that, I discovered, is in sync with my heartbeat. Opthomologist checked for detached retina, (nope), and happens in either right or left eye. I've always assumed it was a high blood pressure thing, as perhaps pressure surges cause the light to dark oscillations. Happens with reflected sunlight also,off nearby lighter colored surfaces. Annoying at first: I went to check the lamp cord ! Rate, like I said, in sync with cardiac pressure impulses, rate at 1/50 hz (that's with Bradycardia, 50 BPM). West coast doctors not keen on discussing LYME disease, as a whole, for whatever reason. So, anyway, I know about distracting 'flicker', for sure, lol. - - RJ |
| schmitt trigger:
--- Quote from: Nusa on April 03, 2023, 09:46:25 pm ---Several things incandescents are better at: 1) Surviving hot environments, such as providing illumination inside an oven. Or in old fixtures that have ZERO ventilation (the fixture was designed for the heat, but the alternative bulbs die from their own heat -- found out the hard way.) 2) Being used as load resistors, with feedback, also known as a dim bulb tester. 3) When being used for their secondary function, providing heat rather than light. They're rather good at it. --- End quote --- 4) For museums and art galleries. Woe on the art director who dares to display a painting illuminated by LEDs or CFLs. |
| tom66:
--- Quote from: Nusa on April 03, 2023, 09:46:25 pm ---Several things incandescents are better at: 1) Surviving hot environments, such as providing illumination inside an oven. Or in old fixtures that have ZERO ventilation (the fixture was designed for the heat, but the alternative bulbs die from their own heat -- found out the hard way.) --- End quote --- In an oven, the bulb almost certainly helps warm up the oven anyway, so I doubt it is a major target for efficiency. Nonetheless, our new Panasonic microwave oven has an LED illuminator and I've seen ovens with these too. If the LED is kept in the 'safe-to-touch' area and well heatsinked, it should last the life of the oven. Plus, the light pattern from carbon filament LED bulbs is a bit naff (and they're not usually that bright) which can make it harder to see things in the oven. |
| m k:
--- Quote from: RJHayward on April 04, 2023, 12:13:38 am ---So, anyway, I know about distracting 'flicker', for sure, lol. --- End quote --- I think I've had some painless migraine symptoms for all my adult life. Every now and then a spot of my vision is blurred, sometimes with pretty clear stair shape, that goes to the right in few hours max. Not a long ago it started from so center that looking a left ear I couldn't see a face. Nowadays I hardly watch TV but earlier when old recordings were shown in digital format I was irritated by loose faces. Back in the CRT time 50/60 Hz lights/picture was also more than a bit disturbing. Seeing is a complex thing. They also say that below hearing frequency sound can create ghosts. |
| Gyro:
--- Quote from: RJHayward on April 04, 2023, 12:13:38 am --- All this talk about flicker, I can't hold my tongue for long: A mysterious part, of my cluster of neurological symptoms (LYME diagnosis), is a visual 'flicker', that, I discovered, is in sync with my heartbeat. Opthomologist checked for detached retina, (nope), and happens in either right or left eye. I've always assumed it was a high blood pressure thing, as perhaps pressure surges cause the light to dark oscillations. Happens with reflected sunlight also,off nearby lighter colored surfaces. Annoying at first: I went to check the lamp cord ! Rate, like I said, in sync with cardiac pressure impulses, rate at 1/50 hz (that's with Bradycardia, 50 BPM). West coast doctors not keen on discussing LYME disease, as a whole, for whatever reason. So, anyway, I know about distracting 'flicker', for sure, lol. - - RJ --- End quote --- Err sorry, I'm probably being dense but I don't follow the maths. The light is going to be flickering at (I thought the US was 60Hz, but anyway) the flicker rate is going to be 20 / 16.67ms (full cycle) or, more likely, 10 / 8.33ms (half cycle), 100 / 120 flickers per second. You are talking about you heart rate being 50 beats per minute. Are you saying that your heart beat is synchronised accurately to within 10 / 8.33 milliseconds? :o Even the fastest QRS portion of the heart cycle is in the order of 100ms. |
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