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When the tungsten in the lightbulb filament reaches the point where it cannot handle the current anymore, because too much of it has vaporized off, it momentarily has a higher amount of current go through it, just before it separates (burns out). From many hours of giving a steady glow, it dies in a last burst of energy flowing through it - more energy than it can handle.

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Q: Why do lights get brighter before they burn out?
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