Nebbermind ... my IRL issues are OBE. (Overcome By Events.) Specifically, it got dark outside before I got done posting. (By December 21st -- Winter Solstice -- we'll be down to only a few hours of daylight, with overcast skes further decreasing the amount.)
LEDs: The U.S. government's restrictions on incandescent lightbulbs has opened the door to a lucrative market in fluorescent and LED lights. Overseas companies are diving through that door in a large herd to make a quick buck. Many of these are 'here today, gone tomorrow.'
So, LEDs burning out is very likely due to inadequate quality control and shoddy manufacturing. From what I've observed, very few 'burnouts' are due to excess voltage.
Regulated output: It's probably not mentioned because quality power converters from reliable companies are presumed to include that feature. (Why mention something 'everyone' includes? It'd be the equivalent of saying, "Our lightbulbs produce light.")
Only the sellers of cheap sub-par power converters would have any reason to mention regulated or filtered output. Then, the mention could be interpreted as an attempt to say "our (cheap) power converter is (very slightly) better than worthless."
It's out there, I've seen it ... companies making statements that cast doubt on the quality of the product they're offering. (Some of it may be due to marketing and sales departments carelessly 'cherry-picking' terms, phrases, and statements ... without listening to the engineers or allowing them to proofread what's being put out to consumers.)
