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.
The values are quoted rated values.
Rated light output LED luminaires
Initial illuminance the start operation
(lm). Unless otherwise
specified, the values apply for ambient
temperature °C.
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.
Note: CLO: constant light output.
Constant light output
If constant light output technology used,
the light output luminaire remains
constant over the lamp life.
Luminous efficacy LED luminaires
Initial value for the ratio light output to
input power (lm/W). This maximum input power corresponds
to the initial value with maximum light
output. This
information contains the losses the light-
deflecting and light-shielding components of
the luminaire and thus the effect the
operating efficiency the luminaire. The
luminaire manufacturer has specify these
parameters for all their luminaires. The measured
output rises the maximum value relative to
the reduction light output the LED type
used. The
operating efficiency not normally shown
separately for LED -luminaires.
The maximum deviation may +10%
(tolerance).
Important LED key figures
.
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.
Rated output LED luminaires
Initial input power luminaire (W). The maximum deviation may –10%
(tolerance)
