Hi, I got an old classic tungsten bulb, not new and also not very old, when a friend turn it on and reported it "blinked" and burned. I thought ok, it burned, let's change it, it happens.
But then I thought: why a bulb blinks bright? Is it the arc the filament creates? Because I did not see it, but a non- electronics expert friend did, I can't describe how was the "flash".
Ok, but then when I change it I realize:
1. the local breaker tripped
2. the internals were all burned - check pictures: one internal wire completely evaporated, the screw got a hole, the little solder joint on the side of the screw got melted and burned. And the (not so weared) filament is broken on 3 points.
Seems a short circuit, but if so, how could that happens? What I miss?