They will last normally 3+ years, but hell no not twenty. Who can come back after 3 years and blame the bulb manufacturer (Chinese)? How can you prove faulty design and not bad wiring or local electric supply fluctuations or problem with receptacle. That's the rub. Used to be product were made to last or be repairable, but as we all know now they are build to be replaced and there is shit we can do about it, which sucks.