General > General Technical Chat
The Dubai Lamp
SeanB:
I did but a few packs of star LED's and mounted them on some heatsinks, with a driver block, running them at lower current. 12W of LED running on 8W of power works well, and runs cold, even on a less than ideal repurposed aluminium heatsink. Great when Eskom decides to turn off the lights on a regular basis.
As to LED lamps, they do fail regularly, almost always due to the infamous black dot of death, but replacing a single LED on the now well toasted MCB board is not going to result in any real life, they are still massively overdriven, poorly heatsinked and the driver has been optimised to be running at close to failure. Linear fluorescent lasts a lot longer, and i still have a good stock of them, though the good ones are starting to be very hard to find.
tunk:
Recently I've seen two dead LED bulbs, one with a blown
smoothing cap and another with a dead chip. I guess both
were heat related.
coppice:
--- Quote from: tom66 on January 15, 2021, 03:22:28 pm ---I haven't had a single LED lamp fail in the 5 odd years since I first started using them. I don't buy the absolute cheapest, but Costco brand ones which are still fairly cheap (3 x 60W equivalent globes for ~£11) and they're still going strong.
Is it really common for LED lamps to fail early? 10+ years lifespan for a cheap product like that is pretty decent IMO.
--- End quote ---
Its three and a half years since we moved in, and filled every light socket in this house with an LED lamp from B&Q. I've had to replace 20%-30% of them. I've never checked what failed. One was in an enclosed luminaire in the bathroom, which could well be due to high temperatures. The others were in the open. LED lamps, like CFLs before them, all say they must not be enclosed. Nobody seems to offer a version with better cooling that is suitable for an enclosed luminaire, even though most homes do have several of these.
ConKbot:
The sad part is it's not even that drastic of an engineering change. Doubling of efficacy by only having the current really isn't that bad. I remember some LEDs having a nice lovely 180lm/W rating, but at a 350mA current that was the defacto standard for rating LEDs, not the 2-3 A which would be their max operating current where it would be down to 100 or so lm/w. I'm not sure how much the LED filaments cost, but I'd be willing to bet that in the cheep versions, it's <50 percent of the total BOM.
tszaboo:
--- Quote from: tom66 on January 15, 2021, 03:22:28 pm ---I haven't had a single LED lamp fail in the 5 odd years since I first started using them. I don't buy the absolute cheapest, but Costco brand ones which are still fairly cheap (3 x 60W equivalent globes for ~£11) and they're still going strong.
Is it really common for LED lamps to fail early? 10+ years lifespan for a cheap product like that is pretty decent IMO.
--- End quote ---
I had a few early LED laps, with high brightness 5mm LEDs that eventually faded, not providing light at all.
Then I had these filament style, Chinese, E17 socketed ones, that I've noticed blinking. I notice PWM and not smooth light output and it bothers me a lot. I think because of the E17 socket, the electronics is a lot more cramped together, so hotter.
Now I usually buy Tradfri bulbs, and didn't had a single one fail. And if you turn down the output with the remote, it becomes more efficient I guess. So its just a press of a button.
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