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csk
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- Incandescent light lamp flickering due to what?
Voltage or Frequency ?
Incandescent light lamp flickering due to ?
Voltage or Frequency ?
Voltage or Frequency ?
Variation of the network voltage: https://en.wikipedia.org/wiki/Power-line_flickercsk said:Incandescent light lamp flickering due to ?
Voltage or Frequency ?
csk said:Summary: Incandescent light lamp flickering due to what?
Voltage or Frequency ?
Incandescent light lamp flickering due to ?
Voltage or Frequency ?
Yes. I imagine they all live in USA, too. The 50Hz mains in Europe makes mains voltage lamps flicker discernibly - especially in peripheral vision. The filament temperature varies enough over the cycle for it to vary in brightness - as the Volts vary . 60Hz is very much better in this respect. Also, 240V filaments are thinner than 120 V filaments - for the same Wattage - so they heat up and cool down more over the cycle.DaveC426913 said:Seems to me peeps are making a bunch of assumptions.
Using my Mentor superpowers, I can verify that the OP lives in a country with 50Hz AC Mains power distribution.sophiecentaur said:The 50Hz mains in Europe makes mains voltage lamps flicker discernibly - especially in peripheral vision.
berkeman said:Using my Mentor superpowers, I can verify that the OP lives in a country with 50Hz AC Mains power distribution.
Oh my gosh! That really is dangerous. Yikes.sophiecentaur said:The flickering of regular 50Hz lamps in UK machine shops is bad enough to give stroboscopic effects that can make rotating machinery appear stationary or very slow. So much so that it is / was standard practice to use low voltage bulbs which, as mentioned earlier, flicker less with less risk of someone not realising a machine was turning in a noisy machine shop.
You may be right about a 50Hz flicker happening in some rare circumstances but perceptibility of flicker has a very soft roll-off with frequency so 100Hz may be noticeable in some circs. Old TVs used 25Hz (or 30Hz) frame rate but they used an interlace system which produced odd and even line scans alternatively, giving 50Hz 'field rate'. Flicker was unbearable, even with that, for some viewers but motion portrayal was judged to be acceptable. Film projectors used to have a shutter which gave two flashes of each frame so the flicker was twice the frame rate. Cinema films were always pretty bad though.Svein said:For a really far-fetched explanation: There is a corrosion on the bulb socket making a sort of diode (anybody remember copper-oxide rectifiers?) which means that the 100Hz flickering (yes, in a 50Hz net an incandescent bulb will normally flicker at 100Hz) will be reduced to 50Hz with a 50% duty cycle.
I imagine they would have shaken themselves to bits with the constant volume changes due to the big temperature range.zoki85 said:Interestingly, light bulbs operated by 25 Hz had shorter lifetimes
There are various failure modes of incadescent light bulbs, and bigger temperature range at lower frequency is undoubtly very important one (especially for delicate carbon filaments light bulbs). Reportedly such bulbs tended to emit buzzing sounds for quite a long time before they would burn out... Generally higher the voltage and smaller the wattage of an incadescent lamp the flicker will be more pronounced at fixed frequency. Objective measure of the flickering effect is called the flicker index. Two incadescent light bulbs made of same materials, one 100 W, 120 V at 25 Hz, second 25 W, 120 V at 50 Hz, have aprox equal flicker indices. Personally I don't notice any flicker in front of panelboard having12 closely placed small 2 W, 230 V, 50 Hz incadescent bulbs. But I noticed I get tired rather quickly while reading near desk lamp with 25 W,230V,50 Hz incadescent bulb.sophiecentaur said:I imagine they would have shaken themselves to bits with the constant volume changes due to the big temperature range.
Incandescent light lamp flickering is typically caused by a loose or faulty bulb, a loose connection in the wiring, or a problem with the light switch. It can also be due to voltage fluctuations in the electrical system.
In most cases, incandescent light lamp flickering is not dangerous. However, if the flickering is accompanied by a buzzing or crackling sound, it could indicate a more serious issue and should be checked by a professional electrician.
If the flickering is caused by a loose bulb, simply tightening the bulb should solve the problem. If the issue is with the wiring or switch, it is best to consult a professional electrician to make any necessary repairs.
LED and CFL bulbs can also experience flickering, but it is less common than with incandescent bulbs. This is because LED and CFL bulbs use different technology and do not rely on a filament like incandescent bulbs do.
In some cases, flickering lights can be a sign of a larger electrical problem. If the flickering is persistent and not caused by a loose bulb, it is best to have an electrician inspect the wiring and electrical system to ensure there are no safety hazards.