What does the term “rated life” of a light bulb mean?
The “rated life” of a bulb signifies the time at which 50% of a large quantity of these bulbs will have burned out. This means that 50% of these bulbs will burn out before the “rated life” and 50% will burn out after the “rated life”. The “rated life” does not mean that every one of the bulbs will last at least that long.
