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ive only watched 2 CFL lamps fail. one of them failed with open filament, watched the opposite filament start glowing, then quit. that was it..
the second one was working and POP, smell of carbon/sulfur and it went out. the ballast driver transistor had shorted/blown.
Then ive seen those cheap chinese flea market ones fail in short order, disassembly has revealed those capxon caps popped.
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