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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#41
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Aldi LED lamps
In article ,
Andy Burns wrote: The wirewound resistor was burnt to a crisp (the lamp didn't fail spectacularly just flickered then faded away) all the surrounding SMDs looked like their solder was cooked and discoloured, one surface resistor had melted away from the PCB, so looks like long term overheating. Seems like the guts of the 13W are pushed too hard. It's what happens with CFLs too. I'd guess they use a large fan to keep them cool when testing. Proably the same lab as VW. -- *How many roads must a man travel down before he admits he is lost? Dave Plowman London SW To e-mail, change noise into sound. |
#43
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Aldi LED lamps
In article ,
Martin Brown wrote: I have only had one of mine from any source fail so far. The 25k hours is for the bare LEDs - I reckon 5k hours is pushing it where the capacitors are concerned and much less if it is cooking in an unsuitable hot enclosure. LEDs don't make much heat but what heat they do produce is more than enough to dry out capacitors over time. As if the public care what fails when it stops working? Seems to come from the same stable as LED watts. Try measuring the actual power consumption from the mains... -- *Is there another word for synonym? Dave Plowman London SW To e-mail, change noise into sound. |
#44
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Aldi LED lamps
Martin Brown wrote:
Andy Burns wrote: The wirewound resistor was burnt to a crisp That sounds more like the switcher failed dead short to ground and the current limiting resistor and all ancillary components were cooked. Could be, when first digging it out, I wondered if the resistor was there as a fuse, but thought they'd usually use a carbon rather than wirewound for that? Then saw it was "mid" circuit, rather than at the mains input, where I assume they'd put a couple to act as multi-purpose (inrush limiting, current limiting and as a fuse?) The 25k hours is for the bare LEDs Yes, I know that ... but should they really get away with claiming it on the packaging, with no small print? LEDs don't make much heat but what heat they do produce is more than enough to dry out capacitors over time. The LEDs are on a sizable chunk of aluminium, about 1cm thick, with not much heatsink compound, the whole of the PSU PCB was potted (not in resin but grey, presumably thermal, silicone). |
#45
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Aldi LED lamps
On Fri, 2 Oct 2015 12:39:00 +0100, Andy Burns wrote:
I didn't want to faff about convincing them to refund/replace, so I took it apart, hoping I might find an obviously failed capacitor in an easily accessible location, no such luck. Fairly normal layout, all potted in soft silicone, input resistors to mains rectifier to bead-type smoothing caps, then there was a wirewound resistor feeding into the ICs/transistor chopper section, feeding small transformer and output smoothing caps. The wirewound resistor was burnt to a crisp (the lamp didn't fail spectacularly just flickered then faded away) all the surrounding SMDs looked like their solder was cooked and discoloured, one surface resistor had melted away from the PCB, so looks like long term overheating. I shall have to open up the two that failed here recently. I shall add that they failed when our overnight mains voltage was pushing 255 and occasionally reached 260... What is the German tolerance on the nominal 230 V they are marked? Indeed, sod lidaldi for LEDs in future, the LEDhut ones of similar age (fewer hours and lower wattage) are still going OK, That's hardly a fair comparison. B-) -- Cheers Dave. |
#46
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Aldi LED lamps
Andy Burns wrote:
wrote: I now have to report that one of the lamps has failed entirely. So that's just 16 months of life, maybe 2 hours a day = 1000 hours. My second one managed more than that, lets say 18 months at 6 hours/day, 3000+ hours, nothing like the 25,000 headline figure on the packaging. I contacted ALDI by email, their response was 12 month warranty, tough. Under EU rules, there is a 6 year liability for inherent faults. If the supposed design life is 25000 hrs then it would seem they have an inherent fault. The retailer can't limit it by a warranty which is shorter. I got a replacement iPhone by quoting this after the Wifi IC failed following one of the IOS updates. The chip failure was a common fault after the update and the IC overheated. I argued the phone had an inherent fault as it was designed to have the OS upgraded. |
#47
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Aldi LED lamps
On Friday, 2 October 2015 21:23:21 UTC+1, Brian Reay wrote:
Andy Burns wrote: wrote: I now have to report that one of the lamps has failed entirely. So that's just 16 months of life, maybe 2 hours a day = 1000 hours. My second one managed more than that, lets say 18 months at 6 hours/day, 3000+ hours, nothing like the 25,000 headline figure on the packaging. I contacted ALDI by email, their response was 12 month warranty, tough. Under EU rules, there is a 6 year liability for inherent faults. If the supposed design life is 25000 hrs then it would seem they have an inherent fault. The retailer can't limit it by a warranty which is shorter. I got a replacement iPhone by quoting this after the Wifi IC failed following one of the IOS updates. The chip failure was a common fault after the update and the IC overheated. I argued the phone had an inherent fault as it was designed to have the OS upgraded. Indeed. Write them an LBA. You're not in a strong position in that you can't prove how much use its had, and you can't expect bulb retailers to replace all dead bulbs free. Aldi are in an iffy position from selling goods that don't match their description. So I'd see it as a gamble. NT |
#48
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Aldi LED lamps
In article ,
wrote: You're not in a strong position in that you can't prove how much use its had, and you can't expect bulb retailers to replace all dead bulbs free. I've seen the life of an LED quoted as 22,000 hours. About 3 years of continuous use. Just about right for the usual Lidl etc warranty. -- *Kill one man and you're a murderer, kill a million youand 're a conqueror. Dave Plowman London SW To e-mail, change noise into sound. |
#49
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Aldi LED lamps
Dave Plowman (News) wrote:
In article , wrote: You're not in a strong position in that you can't prove how much use its had, and you can't expect bulb retailers to replace all dead bulbs free. I've seen the life of an LED quoted as 22,000 hours. About 3 years of continuous use. I've seen manufacturers and sellers claim this (or similar). I haven't seen any independent testers confirm it. -- Timothy Murphy gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin |
#50
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Aldi LED lamps
In article ,
Timothy Murphy wrote: Dave Plowman (News) wrote: In article , wrote: You're not in a strong position in that you can't prove how much use its had, and you can't expect bulb retailers to replace all dead bulbs free. I've seen the life of an LED quoted as 22,000 hours. About 3 years of continuous use. I've seen manufacturers and sellers claim this (or similar). I haven't seen any independent testers confirm it. Well, yes. Seems to me if they want to claim such things, should be backed up by a warranty. -- *Parenthetical remarks (however relevant) are (usually) unnecessary * Dave Plowman London SW To e-mail, change noise into sound. |
#51
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Aldi LED lamps
On Mon, 05 Oct 2015 11:12:42 +0100, Dave Plowman (News) wrote:
In article , Timothy Murphy wrote: Dave Plowman (News) wrote: In article , wrote: You're not in a strong position in that you can't prove how much use its had, and you can't expect bulb retailers to replace all dead bulbs free. I've seen the life of an LED quoted as 22,000 hours. About 3 years of continuous use. I've seen manufacturers and sellers claim this (or similar). I haven't seen any independent testers confirm it. Well, yes. Seems to me if they want to claim such things, should be backed up by a warranty. Those that I got from Ledlam are 50kh and have a 5-year warranty - time will tell... -- Peter. The gods will stay away whilst religions hold sway |
#52
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Aldi LED lamps
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