Re-start
High-pressure discharge lamps need to
cool down for several minutes before they
can started again. The output sodium vapour lamps
and high-pressure mercury lamps can be
restricted stages. The
new series special models for indoor and
outdoor applications constitute excep-
tion. For some
metal halide lamps, only certain operating
positions are allowed avoid unsta-
ble operating states. Compact fluorescent
lamps may usually used any operating
position; however, important properties
such the lumi
nous flux vs. Nevertheless, there
are reasons why efficient conventional
lamps should still used. Most
manufacturers’ metal halide lamps continue
to incompatible with dimming because
dimming may have uncontrolled effects on
lighting quality and lamp service life.
Dimmability
As well incandescent and halogen
incandescent lamps, almost all fluorescent
and compact fluorescent lamps can be
dimmed required nowadays.
They can rightly viewed the light source
of the future.
The key parameters lamps can essen-
tially defined the following terms:
Warm-up time
Discharge lamps particular need between
30 seconds and several minutes warm up
and output the full luminous flux. Some properties
that have taken into account when
working with these lamps are listed below.
It therefore the expertise the
planner find the best possible light source
for any lighting task.
105°
45°
30°
h 105 30
admissible not admissible
. LED light sources can
be switched and dimmed required.
Operating position
Manufacturers specify the permitted oper-
ating positions for their lamps.96
The Lighting Handbook
Properties conventional lamps
Conventional lamps today are normally only
used replacements.
On account their high luminous effi-
ciency and long service life, LED light sources
in particular are dominating all applications. temperature
curve may vary with the position
