That's interesting, I've never heard of this issue. Do you know the problem it causes and how big if an issue it is?
Up and down lights, is there a problem??
- Thread starter mg123
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Some led bulbs may not as reliable as others and the on board electronics possibly more prone to either total failure; or at least reduced driver output. I have an outdoor led lamp in a bulk head installation with integral PIR. The bulb failed in that housing, whilst in other non PIR areas (indoors in a garage) the dame type and wattage have lasted, are lasting, far longer. The PIR unit has frequent on/offs due to assorted critters critters triggering it (think moggies, foxes erc.). Current bulb of another brand thus far is holding up ok. Flashing led systems have different electronics and so on and are designed for that flashing operation; other bulbs not so. I’m still inclined suspect the bulb and its built in driver in this case, producing correct volts hence the problem as described. The problem with led system with non replaceable bulbs is one never knows if it’s the drivers, or the led effectively failing as any diode system can have leakage across the diode(s) or go high resistance (the latter being unlikely though). I have seen led bulbs start ti show reduced output before they actually fail (before the claimed life of sed bulb).
LED's have zero issues with being 'flashed'- they are a solid state component!!!
The failure of 'cheap' LED bulbs is usually manufacturers overdriving the LED's inside badly, in order to use less LEDs to get the same output (this is the cause of most early LED bulb failures) and there are some that are guaranteed to fail in only a few hundred hours or less of use- with them being overdriven by 200% or more of their maximum allowable current!!!
(there is a youtuber named Big Clive from the UK that his entire channel is 'teardowns' of electronic devices- and LED bulbs feature prominently on it)
It isn't the 'only' failure mode (excess heat can cause failure of the drivers true- usually capacitive dropper style circuits although these circuits are rare these days, and really only were found in the earlier LED bulbs) but overdriven LED's are by far the biggest issue- the cheaper the bulb the more likely it is that they are being overdriven to cut down on manufacturing costs...
Apparently they get disoriented and it causes issues with their flight paths. They are the genetically close to humans and can communally hold back giving birth due to weather and other circumstances and have communal nurseries.
They are protected and are becoming more scarce.
Wonderful little creatures.
Have you had the circuit tested properly? Could be a loose neutral causing issues or maybe a volt drop issue if the circuit is too long (unlikely in a normal size properly thou) ! I remember a job from years back where customer was having issues with her living room lightbulbs flickering and or not switching on sometimes; that turned out to be a loose neutral. Did the symptoms start after a noticeable change in ambient temperature ?
That wouldn't cause just the top bulbs in a twin light fitting to fail...
If the two lamps are being driven by the same voltage o/p from the driver /power module, i.e. they don't each have their own driver module... and they're connected to exactly the same voltage point, then I would be inclined suspect the dimmer lamp is simply suffering from old age or excessive abuse... I would however expect the two lamps to be isolated from on another? If they are indeed isolated from each other then it may be that the dimmer lamp has a failing volts supply.
The driver module - 230 volts in and whatever volts out - will have an SCR or its current replacement chip. SCR have a history of slowing failing - as in leaking and thus a drop in the DC volts out.(in days of yore... When an SCR was failing there was often smell like rotten fish (actually it was silicone dioxide...) and It was warning to locate and replace sed SCR; and also to ensure the area was well ventilated as the gas being emitted by the failing SCR was toxic... If as is often the case today these units use switched mode psu or similar (all on a single chip) ... the same can apply, and again one of the o/p might equally be failing whilst the the other is ok (presuming again the two lamps are isolated from another). Is it not possible to replace the dim bulb with a new oneto see if it makes any difference? It it can be replaced and condition remains the nit points to the driver module. If the replacement lamp is normal o/p then probem solved?
incidentally, slightly off topic... if you're wearing hearing aids and switch them to 'phone mode... approach any led light source and you'll hear just how much junk leds radiate - as you'll hear them "sing"... Buses, trains etc. are saturated with their noise... as are most stations, shopping centres. Whereas in homes (mine at least) there is almost none. Presumably this is because the typical domestic led bulb replacements for incandescents are designed somewhat differently to those used in commercial and public areas, and transport and so on...?
The driver module - 230 volts in and whatever volts out - will have an SCR or its current replacement chip. SCR have a history of slowing failing - as in leaking and thus a drop in the DC volts out.(in days of yore... When an SCR was failing there was often smell like rotten fish (actually it was silicone dioxide...) and It was warning to locate and replace sed SCR; and also to ensure the area was well ventilated as the gas being emitted by the failing SCR was toxic... If as is often the case today these units use switched mode psu or similar (all on a single chip) ... the same can apply, and again one of the o/p might equally be failing whilst the the other is ok (presuming again the two lamps are isolated from another). Is it not possible to replace the dim bulb with a new oneto see if it makes any difference? It it can be replaced and condition remains the nit points to the driver module. If the replacement lamp is normal o/p then probem solved?
incidentally, slightly off topic... if you're wearing hearing aids and switch them to 'phone mode... approach any led light source and you'll hear just how much junk leds radiate - as you'll hear them "sing"... Buses, trains etc. are saturated with their noise... as are most stations, shopping centres. Whereas in homes (mine at least) there is almost none. Presumably this is because the typical domestic led bulb replacements for incandescents are designed somewhat differently to those used in commercial and public areas, and transport and so on...?
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