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What is the definition of lamp life for a fluorescent lamp?

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What is the definition of lamp life for a fluorescent lamp?

A.

The time at which lamps begin to fail

B.

The time at which 50% of a large sample of lamps have failed

C.

The time at which 70% of a large sample of lamps have failed

D.

The time at which lumen output has reduced by 50%

E.

The time at which lumen output has reduced to 70% of the initial light output

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