It's a far cry to run 10 volts of LED from a 14 volt DC supply compared to running it from 120VAC. The only "cheap" way to do it is how you see it in the flickery cheap LED bulbs; a capacitive dropper. These suck besides having an atrocious power factor.
This leaves the only good solution to some sort of switching supply, and anytime there is AC -> DC conversion, there has to be a filter capacitor, which seems to be the weak link. Sadly, 2 years is long enough for people to "forget", and who is going to pay 2X more at the checkout for a longer lasting one? A competing bulb built with a high-quality power supply using film-based filtering just isn't going to sell against one twice as cheap that uses low-quality electrolytics. The only place it does is in the commercial lighting space. Go look at some of the prices! On Fri, Apr 2, 2021 at 11:26 AM Lee Hart via EV <[email protected]> wrote: > Robert Bruninga via EV wrote: > > The resistor is far more reliable than the modern DC switching > electronics > > th ey put in consumer bulbs. > > My LED bulbs throughout the house fail about one evey month or so (ouit > of > > 50 and not a single one has been due to the LED, but due to the voltage > > regulating electronics. > > > > A series resistor is MUCH more reliable > > I've had the same experience. Despite the marketing claims, my LED > lights only seem to last a few years. In every case, the LEDs themselves > are still good; it's the electronics that have failed. > > I suppose they don't use a resistor because it would lower their > advertised efficiency. And, they get hot. If the LED light is installed > inside a fixture, that could be a problem. > > Lee > > -- > All children are born engineers. Watch them at play. They're not > just playing; they're experimenting, building and learning. That's > engineering! Then we get them in school and squash it out of them. > (Geoffrey Orsak, Southern Methodist University dean of engineering) > -- > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/ > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210402/73ebe910/attachment.html> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
