Technical information
1
0
3
.1.
2
V
ar
i
at
i
on
i
n supp
l
y vo
l
tage
f
or a
d
apte
d
i
n
duc
t
a
n
ce
S
ome countries have supply volta
g
es that permanently
deviate
f
rom 230V. When usin
g
correspondin
g
ly adapt
-
ed inductances, the following points must be taken
i
nto account
.
3.1.2.1
O
peration at suppl
y
volta
g
e hi
g
her than 230 V
w
i
t
h
a
d
a
p
te
d
c
h
o
k
e
i
m
p
e
d
ance
A
n increase in supply voltage shi
f
ts the maximum o
f
the choke characteristic curve
(P
L
over
U
L
/U
N
)
. In the
lamp volta
g
e ran
g
e of
OS
RAM lamps
(
approx. 100 V
)
,
t
h
e c
h
an
g
e
i
n
l
amp watta
g
e w
i
t
h
c
h
an
gi
n
g
l
amp vo
l
t
-
a
g
e
i
s steeper.
I
n a
ddi
t
i
on, t
h
e max
i
mum watta
g
e t
h
at
can
b
e ac
hi
eve
d
w
i
t
h
i
ncreas
i
ng
l
amp vo
l
tage
i
s
l
arger,
as s
h
own
i
n
Fig
. 9.
N
orma
ll
y, t
h
e
l
amp vo
l
ta
g
e
i
n-
creases with increasin
g
service life
(
see also chapter 6
“Lamp service life, a
g
in
g
and failure behavior”
).
A
ccordin
g
to equation Eq. 4.1, watta
g
e o
f
about 150 W
is achieved
f
or a 150 W choke with a lamp volta
g
e o
f
100
V
.
Th
e max
i
mum t
h
e
l
amp watta
g
e can
i
ncrease
to
f
or a lamp volta
g
e o
f
150 V is 175 W. The hi
g
he
r
achievable watta
g
e can reduce the service li
f
e and
possibl
y
cause an increase o
f
undesirable e
ff
ects at
the end of the service life (e.
g
. lamp explosion)
.
OS
RAM lamps are
g
enerally desi
g
ned to operate at
230
V
supp
l
y vo
l
ta
g
e an
d
un
d
er
g
o correspon
di
n
g
ser-
vice li
f
e testin
g
. There are, however, also systems at
400 V, e.g.
f
or some discharge lamps > 1000 W. Fo
r
these lamps, the
f
ollowin
g
explanations apply in the
same way. The use o
f
hi
g
h intensity dischar
g
e lamps is
t
h
eoret
i
ca
ll
y a
l
so poss
ibl
e at 277
V
operat
i
n
g
vo
l
ta
g
e
w
i
t
h
a
d
apte
d
i
mpe
d
ance an
d
ig
n
i
t
i
on
d
ev
i
ces, a
l
t
h
ou
gh
suc
h
o
p
erat
i
on
i
s assoc
i
ate
d
w
i
t
h
cons
id
era
bl
e
di
sa
d-
vantages
.
a
)
An increase in ne
g
ative effects must be expected
at the end o
f
the service li
f
e, because watta
g
e
r
i
ses c
l
ear
l
y a
b
ove t
h
e nom
i
na
l
watta
g
e w
h
en
lamp volta
g
e increases on account o
f
the shi
f
ted
choke
cha
r
ac
t
e
r
is
t
ic
cu
rv
e
.
The
i
n
c
r
eased
w
a
tt-
a
g
e input
f
or lamps with already a
g
ed arc tube
wa
ll
can cause
i
ncrease
d
l
amp exp
l
os
i
on rates,
f
or exam
p
le.
Op
eration in overload conditions
will probably cause accelerated a
g
in
g.
b
)
The stee
p
er characteristic
P
L
(U
L
)
in the ran
g
e of
t
h
e norma
l
l
amp vo
l
ta
g
e causes a
high
er sprea
d
o
f
the watta
g
e and there
f
ore o
f
the photometric
d
ata, e.
g
. perce
i
ve
d
co
l
our var
i
at
i
on
.
W
e there
f
ore discoura
g
e operatin
g
the lamps at 277
V
supply volta
g
e.
O
ur lamps have been developed and
under
g
one service li
f
e testin
g
at 230 V supply volta
g
e,
so that we cannot assume an
y
warrant
y
f
or the service
life behavior and photometric data for any deviatin
g
o
p
erat
i
on
.
3.1.2.2 Operation at supply voltage less than 230 V
w
i
t
h
a
d
apte
d
c
h
o
k
e
i
mpe
d
ance
S
upply volta
g
es of less than 230 V
shif
t t
he
m
a
x
i
m
u
m
o
f the choke curve
(P
L
over
U
L
/U
S
)
.
Op
eration at 200 V
supply volta
g
e
f
or example is more
f
avorable than at
230 V with re
g
ard to the chan
g
e in lamp watta
g
e with
l
amp vo
l
ta
g
e.
Th
e
P
L
(U
L
)
curve runs fl atter in the normal
ran
g
e o
f
lamp volta
g
e. For lamp volta
g
es exceedin
g
130 V Watta
g
e
f
alls a
g
ain
.
T
here is a major drawback that with lower suppl
y
volt
-
ag
e, there is also less volta
g
e available
f
or re-i
g
nition
af
ter the current has passed zero crossin
g
. I
f
the mo-
m
entary supp
l
y vo
l
ta
g
e
i
s
l
ower t
h
an t
h
e re-
ig
n
i
t
i
on
volta
g
e, the lamp
g
oes o
ff
. Normally, the lamp volta
g
e
a
nd also the re-i
g
nition peak increase with increasin
g
service life
(
see also chapter 6, “Lamp service life, a
g
-
in
g
and failure behavior”). That means that a reduction
in supply volta
g
e causes a shorter service li
f
e in many
l
am
p
s
.
Fig
. 9:
L
amp current
I
L
,
l
amp watta
g
e
P
L
o
v
e
r t
he
r
a
t
io
o
f
lamp volta
g
e to suppl
y
volta
g
e U
L
/U
S
f
or
U
S
=277
V
Fig
. 10:
L
amp current
I
L
,
l
amp watta
g
e
P
L
o
v
e
r t
he
r
a
t
io
o
f
lamp volta
g
e to suppl
y
volta
g
e U
L
/U
S
at
U
N
=2
00
V
200
180
160
140
120
100
80
60
40
20
0
Lamp power P
in W
L
Lamp current I in A
U /U
L
S
3
2,5
2
1,5
1
0,5
0
0
0,5
1
L
U /U
L
S
Lamp current I
in
A
3
2,5
2
1,5
1
0,5
0
Lamp power P
in W
L
0
0,5
1
200
180
160
140
120
100
80
60
40
20
0
L