73
The Lighting Handbook
Light output, output and luminous efficacy
The light output, output and luminous
efficacy are important key parameters to
describe the efficiency LED luminaires.
Important LED key figures
. The
operating efficiency not normally shown
separately for LED -luminaires. Unless otherwise
specified, the values apply for ambient
temperature °C.
Luminous efficacy LED luminaires
Initial value for the ratio light output to
input power (lm/W).
This takes into account the fact that minor
fluctuations may occur between the individual
measured values during the production
period luminaire type consequence
of production conditions. This
information contains the losses the light-
deflecting and light-shielding components of
the luminaire and thus the effect the
operating efficiency the luminaire. This maximum input power corresponds
to the initial value with maximum light
output.
Rated light output LED luminaires
Initial illuminance the start operation
(lm). The measured
output rises the maximum value relative to
the reduction light output the LED type
used. The maximum deviation may –10%
(tolerance).
Constant light output
If constant light output technology used,
the light output luminaire remains
constant over the lamp life.
Note: CLO: constant light output.
The values are quoted rated values.
ATTENTION: The light output and luminous
efficacy for built-in LED modules are higher
than those the luminaires, that these
cannot compared with each other.
The maximum deviation may +10%
(tolerance).
Rated output LED luminaires
Initial input power luminaire (W). The
luminaire manufacturer has specify these
parameters for all their luminaires
