Datasheet

20
TS 46365 OSRAM / POWERSTAR HQI 106_T001_GB 2/22.04.2009
Lamp life
There are a confusing number of definitions for lamp life,
and these differ from one region to the next and from one
application to the next. The basic definitions for the most
common types are given below.
This document refers explicitly only to the average life.
Average life:
Average number of hours burned over several groups in
which in the group in question half the lamps have failed
as the result of a defect (50% failure).
Survival rate:
Quantity of working lamps of a group of lamps after a
defined number of burning hours.
Average value of some groups.
Minimum life:
Minimum period of time in which a lamp remains in opera-
tion under laboratory conditions.
Economical life:
Period of time between group relamping of an installation
under the condition that operating costs are minimised
and the installation luminous flux does not fall below
a particular value. This will vary according to the appli-
cation.
Service life:
Simplified practical view of the economical life.
This is the operating time after which the installation
luminous flux (the product of the relative luminous flux
and the lamps still in operation) is still around 70%
(sometimes 80%).
POWERSTAR HQI-T < 150 W
130
%
120
110
100
90
80
70
P
L
U
L
I
L
90 95 100 105 110%
Mains voltage
Φ = Luminous flux
I
L
= Lamp current
P
L
= Lamp wattage
U
L
=
Lamp voltage
= Not permitted
POWERSTAR, other versions
130
%
120
110
100
90
80
70
P
L
U
L
I
L
90 95 100 105 110%
Mains voltage
Φ
Φ
Operating characteristics in relation to
the supply voltage
Photometric and electrical data:
All lamp-specific electrical and photometric data is
measured after 100 hours of operation under laboratory
conditions on reference equipment.
Unless otherwise indicated, the data relates to the hori-
zontal burning position for T and TS types and to the
base up burning position for E types. If different burning
positions are used in actual practice there may be consid-
erable changes in the lamp data, particularly with regard
to luminous flux, colour temperature and lamp life.
The luminous flux is virtually unaffected by the ambient
temperature outside the luminaire. At low ambient tem-
peratures down to around – 50 °C special igniters are
needed.
Detailed information on heat accumulation tubes (lumi-
naire simulators) for determining lamp data for HQI
®
-TS
and HCI
®
-TS is given in IEC 61167, clause 1.7.
Colour deviations:
With all metal halide lamps there may be differences in
colour from one lamp to the next due to external factors
such as mains voltage, type of control gear used, burning
position and luminaire design.