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A lamp at the end of its life
What does a lamp look like at the end of its life:
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The
lamp must be replaced |
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No
quality defect, but just like a car’s tyre that has been
used, a bulb must be replaced when it is "worn out".
Different lamps and different manufacturers have different
lives. |
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The
bulb is "black" due to the filament’s tungsten,
which evaporated and was deposited on the glass wall |
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The
"older" the lamp, the "blacker" it
is. The "blacker" the bulb, the less light comes
out. Less light may compromise safety. That is why lamps
should always be changed in pairs, as even though the
other lamp might still be functioning, it probably will
be giving a lot less light than it did when it was new. |
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