Electronics > Repair
Why/how do these LED lamps fail so fast?
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themadhippy:

--- Quote ---simply putting a resistor or potentiometer in series.
--- End quote ---
on AC a capacitor is a better option

--- Quote --- But I cannot see how to do it for a ceiling fixture controlled by a wall switch
--- End quote ---
If you can live with 1 or 2 fixed levels change the single gang switch for a 2 or 3  gang  2 way switch  and wire the caps in the back of the switch.
IanB:

--- Quote from: soldar on September 20, 2023, 09:48:07 pm ---I have not had good luck with dimmables. I bought a load of them at Ikea and they are complete crap. They sort of work (with a triac dimmer) in the brighter range but with more dimming they start to flicker. Utter crap.
--- End quote ---

This seems to depend on the brand. I am getting really good results with Philips bulbs and a Lutron trailing edge dimmer (the Philips bulbs being the most important part of the equation).


shakalnokturn:
"The black spot of death" that could be caused by overcurrent (including overshoot at power up if PS is poor design), excessive heat or just inevitable thermal cycling.
The odds are that the bonding wire breaks away from the die slightly, the PS being constant current, when supplying an open string will hit its voltage limit often high enough for the open LED to arc, causing the whole string to flicker.

LED bulbs are definitely not what they're advertised to be, on average they're junk! (Once procuction, lifetime and recycling are taken into account I'd bet they're less ecological than your old tungsten filament...)
Osram in my experience have been expensive crap. I have had decent results with Philips and Toshiba though.
alligatorblues:
If LEDs are run off constant current, the voltage remains steady. But if the current is not well controlled, the voltage will rise exponentially in comparison to the rise in current. It sounds like a poor design. The current creeps up. I doubt if it's worth trying to salvage.
dobsonr741:
+1 for Philips. I’m only buying 458430.
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