3
•
afe operation of metal halide lamps depends
on the use of luminaire
arts
lam
holder, leads
etc.
which can withstand the hi
h temperatures
at can poss
occur
n t
e case o
outer
u
sc
ar
e
•
art
rom
urst-
rotecte
am
s
or o
erat
on
n open
um
na
res, a
amps must
e operate
n
m
n
r
•
meta
a
e
amps w
t
sma
watta
e must
e equ
ppe
w
t
a sa
e
uar
to protect t
e
lamp from the effects of as
mmetrical conduc-
ivit
e.
. chokes with thermal protection
.
•
t
s a
v
sa
e to use
n
t
on un
ts w
t
t
me
t-
t
•
tr
n
t
n
t
electronic ballast has a correspondin
cut-out
m
n
m
n complying with all safety measures, m etal
a
e
amps are sa
e to operate an
prov
e a
brilliant, efficient li
ht.
Rectifying effect causes a high DC current component.
s a resu
t, t
e c
o
e
oes
nto saturate
state w
t
a mar
e
ecrease
n c
o
e
mpe
ance.
n extreme
cases, t
e
amp current
s on
m
te
t
e c
o
e
s
m
r
t
n
ermanent
excess
ve current causes a
ramat
c
n-
crease in the temperature o
the choke windin
s until
t
e
nsu
at
on
s
estro
e
an
s
ort c
rcu
ts occu
etween t
e c
o
e w
n
n
s
ese
enomena can occur w
t
meta
a
e
am
s
see warnin
in IE
61167
so that the standards have
stipulated safet
measures for luminaires
see IE
60598-1 Para
raph 12.5.1
.
imilar re
ulations exist
or hi
h intensity sodium vapor lamps in the IE
60662
t
n
r
sa
et
measure in the circuit such as a thermal
switch or a thermal
use, inte
rated into the ma
netic
ballast, protects the circuit
rom such dama
e
In accordance with a declaration issued b
lamp manu-
acturers in reaction to standard EN 62035, published
by the LIF
Li
htin
Industry Federation Ltd
in Techni-
cal
tatement No. 30, and b
the ZVEI in the “Lamp
manu
acturers statement re
ardin
EN 62035”, certain
lamps do not require an
sa
et
measures to prevent
as
mmetrical conductivit
. As far as
RAM’s metal
halide lamps are concerned, this re
ers to lamps with
watta
e levels o
1000 W and more
lthough asymmetrical conductivity is generally pos
s
e
n
amps w
t
watta
es
1000
ot
ur
n
t
e
start and in stead
state, the dimensions o
the arc
tu
e an
amp components means t
at t
e ten
enc
to as
mmetrical conductivit
is
ar less than with
sma
er watta
e
eve
s, an
s wea
enou
n stea
y
state that no sa
ety measures against asymmetrical
con
uct
v
t
are requ
re
RAM PTi is not affected b
as
mmetrical conduc
t
v
ty, as current an
vo
ta
e are mon
tore
an
con
trolled, which is wh
it is recommended
or the opera
tion o
dischar
e lamps
6.3.10
onclusions
t
s w
se not to operate meta
a
e
amps r
t up
to the end o
their natural service li
e, but to re
lace
them at the end o
the economic li
e. This is a
ro
ri
ate because the luminous
lux decreases noticeabl
on exceedin
the economic li
e, and the probability o
n
ir
l
t
in
r
t th
n
th
rvi
li
Lamps should be replaced be
ore reaching the
economic li
e i
the li
ht colour o
the lamp chan
es noticeably
the luminous
lux decreases considerabl
the lamp will not ignite
• the lamp
oes on and off intermittently
“cyclin
”
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