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> Almost all LED bulb failures are because the power supply died due to overheating, not the LEDs themselves. It's true that the power supply versions are so p
by nabilhat 4y ago
> Almost all LED bulb failures are because the power supply died due to overheating, not the LEDs themselves.
It's true that the power supply versions are so poorly designed and inefficient that heat is a problem. Design and quality control effort could reduce heat generated by the entire assembly to a fraction of what the socket, fixture, and wiring can sink.
It's more common now to find bulbs that have no power supply at all. They're literally a rectifier made of LED's in series. If the bulb flashes at 2 * mains frequency, that's likely what you have. They die out quickly because the LED strings add up to a maximum voltage a bit over mains voltage, but that's RMS not peak. It's a natural outcome, as using enough LED's to accomodate peak voltage reduces light output by underdriving them, increases obvious flicker from dwell time below minimum voltage, and increases cost.
Hotwired LED strings are cheaper to design, source, assemble, bad parts fail fast more consistently with no effort wasted on quality control, and the market's so flooded and volatile that there's no room for consumer side quality awareness effective enough to make the negative outcomes matter. Power supplies in these bulbs are going away. Ubiquitous 2 * mains frequency strobing, short-lived, hotwired LED bulbs is where the home LED lighting market is taking us.