Philips Electromagnetic Lamp Indoor Furnishings User Manual


 
Ambient and operating temperatures
Temperature is of prime importance for the proper functioning
of discharge lamps (Fig. 127a/b). In general, fluorescent lamps are very
sensitive to changes in the ambient temperature (see section 3.6:
Effects of temperature).
For the total system the ambient temperature also is of great
importance,due to the fact that certain minimum and maximum operating
temperatures are specified for the various components.
Minimum temperatures
1) Lamps
Supplied with the nominal voltage, fluorescent lamps will start quite
normally at temperatures down to approx. -20 ºC.The minimum
allowed temperature depends on lamp type and starting system, which
determines the maximum ignition time (ranging from 2 to 20 seconds).
Also the circuitry (leading or lagging) has influence on the ignition
process.Two lamps in series normally ignite less easily than the one lamp
circuitry. In the lamp data sheets the minimum temperature and the
resulting ignition time can be found for the various circuits. Below these
specified temperatures smooth ignition cannot be guaranteed.
In the table below, the ignition time of a PL-L 24 W lamp (in sec) is given
as a function of lagging or leading circuitry, nominal or sub-nominal
supply voltage, type of starter and ambient temperature.
312
5
133
Fig. 127a. Relative values of luminous flux (
Φ
),
lamp voltage (V
l
), lamp current (I
l
) and lamp
wattage (P
l
) as a function of lamp head
temperature, for a PL lamp.
Fig. 127b. Relative values of luminous flux (
Φ
)
as a function of the ambient temperature
and the burning position (PL lamp).
3.12 Ambient and operating temperatures
120
100
80
60
40
20
20
30
40
50
60
70
%
lamp head temp. (˚C)
I
l
P
l
V
l
Φ
recommended 
temperature range
100
80
60
40
20
0
-20
0
20
40
60
Φ (%)
ambient temp. (˚C)
Circuit Lagging Leading
Voltage Nominal Nominal -8% Nominal Nominal -8%
Starter S10 ES08 S10 ES08 S10 ES08 S10 ES08
Ambient temp.ºC
-30 10 2 * 2 * * * *
-25 7 2 * 2 20 2 * 2
-20 6 2 12 2 8 2 15 2
-15 6 2 12 2 8 2 15 2
-10 6 2 10 2 7 2 14 2
-5 6 2 10 2 7 2 11 2
0 6 2 10 2 7 2 11 2
+5 62 92 62 82
* Proper ignition not guaranteed.