Mains Powered China Emergency Bulb By delabs | September 1, 2010 - 12:02 pm |September 1, 2010 Contraptions, Electrical A typical Mains Powered China Lamp. On power down, LED light turns on for around 1/2 hr. Gets damaged on lightning activity and wide (uS not nS) transients above 300V. Drawing may have error. From Schoodles Tagged Lamps-LED, Schoodles. Bookmark the permalink.