recent years, as direct result of environmental concerns, the Mercury content
of fluorescent lamps has been steadily reduced to lessen the impact
on the environment when the lamps reach their end of life and require recycling
or safe disposal. The RoHS directive imposes strict limits on the amount
of potentially hazardous substances that substances identified in this
directive. Lamp manufacturers are required to comply with these limits
and have initiatives to remove all Mercury from fluorescent lamps in
the near future.
Since its introduction
five years ago, Perferm™ technology
range of emergency modules, which incorporate enhanced striking technology
and permanent heating of the lamp cathodes in emergency mode, have
gained favour with many of the major emergency lighting companies within
Europe and the Middle and Far Eastern countries.
operate with most standard Mercury; reduced Mercury and Amalgam based
fluorescent lamp types and thus offer customers who supply emergency
lighting luminaires a safeguard against potential compatibility problems
when lamps are replaced with lower Mercury level lamps, at later date.
This is becoming
more of an issue because more of an issue because as the Mercury levels
in fluorescent lamps continue to fall, conventional modules without Perferm™ technology
are already failing to provide correct emergency operation, which at
best dramatically reduces lamp life and can lead to poor colour rendition
or 'pink limbs' on some compact fluorescent lamps and in some extreme
instances, no light from the lamp in emergency conditions.
We now offer two
alternative versions of the Perferm™ with
the PH4000 and PL4000 series offering all the advantage of Perferm™ without
the additional mains ballast delay control relay found in the PLR5000
and PHR5000 Perferm™ Plus
modules. These have been designed specifically for use with multi-lamp
or dimmable electronic ballasts where 'lock out' can be a problem (supply
present but the ballast has shut down because the emergency lamp has
been temporarily disconnected from the ballast during testing.) This
is the case where a keyswitch is used fail the permanent supply (to
test the emergency lightning), whilst the switch supply is still present
at the electronic ballast. The additional relay introduces a small
time delay before the power is reconnected to the electronic ballast,
allowing it time to reset correctly after the emergency test.