General > General Technical Chat
Explain to me the (de?)-evolution of LED lightbulb technology
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andy2000:
My biggest complaint about cheap LEDs is flicker.  Many have little to no power supply filtering, so they're effectively 120 Hz strobe lights.  There should be a standard for measuring flicker, and labeling should be mandatory like it is for brightness and color temperature. 
Red Squirrel:
I thankfully have not run into that with household bulbs, but lot of Christmas lights sets are bad for that.  I really wish it was possible to buy higher quality Christmas lights, even my "good" sets for the house that I paid more for are not that great as they are not as bright as the good ol C9s, and one of my sets died this year, it was only a few years old.  Most of them you can't even change bulbs as they are all built in.   
Zero999:
There seems to have been a wide range of personal experiences here.

I replaced all of the bulbs in my parent's house with LED around eight years ago and barring a couple of really cheap Chinese ones, they've lasted really well. I've had a mixed experience. One of the LED filament lamps in my cooker fume extractor hood failed after only a couple of months. I accept a cooker hood is a bad place for an LED bulb, but the one in my parent's cooker hood lasted for years. One of the LED downlighter lamps failed in my kitchen, after around four years, yet the ones in my parent's kitchen lasted for much longer.

I dislike linear regulators, in LED lamps. They're especially bad at higher voltages and temperatures, which will cause them to throttle back the current, if you're lucky. Capacitive dropper isn't a bad choice, as long as it uses a decent quality capacitor, with plenty of filtering to reduce ripple. Switched mode is obviously the best type of power supply and is worth the extra money.

It should be easy to design and make an efficient LED lamp, which might actually be worth doing, if off the shelf units deteriorate, even if it's much more expensive.

RoGeorge:

--- Quote from: TimNJ on March 23, 2021, 03:13:59 am ---In my experience, the newer bulbs have poor reliability, but I can't tell if that's a result of their overall design topology or if they are just built like crap. Or both.

--- End quote ---

Or third.   8)

rsjsouza:
Great video; thanks for sharing!
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