What is the mean lumen output of a fluorescent
lamp,
and how is it different from the initial lumens? |
| Since fluorescent
lamps have such a long life compared to
incandescent lamps, eventually the brightness
(lumen output) of the lamp will begin to
decrease. |
| Because of
this, fluorescent lamps have an initial
lumen rating and a mean lumen rating. The
mean lumen output is measured at 40% of
the lamp life. |
| NOTE: Decorative
or colored bulbs do not have a lumen rating
since they are not considered a primary
source of lights, only decorative. |
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