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Average
Rated Life
An average rating, in hours, indicating when 50% of a large group
of lamps have failed, when operated at nominal lamp voltage and current; manufacturers
use 3 hours per start for fluorescent lamps
and 10 hours per start for HID lamps when performing lamp life
testing
procedures; every lamp type has a unique mortality curve that
depicts its average rated life
Luminous
Flux
luminous Flux is overall light output (quantity of light) in unit
time.It
is expressed in lumens(lm).
Luminous
Intensity
The light source emits luminous flux in unit stand angle in given
direction.
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Light Sources
