OSRAM QUICKTRONIC-M ECG for circular FL 16 mm - Manual (Page 77)

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7.5.3 Luminaire
Optimisation
With the mentioned measuring principle the best correlation between
ambient temperature and cold spot temperature of the T5-lamps is
achieved.
7.5.4 Maximum luminous
flux for FH ® …HE
fluorescent lamps
So called Horseshoe Curve shows the correlation in between the cold spot
temperature and the ambient temperature ta.
7.5.5 Verticalness
Operation
If luminares are operated in horizontal position the lamp stamp of the
FH
® …HE und FQ ® …HO fluorescent lamps have to be placed down.
Luminaires with circular FC
® lamps have to have the lamp socket
positioned down.
Attach the thermocouples in the area of the lamp caps
within a distance of 2mm from the glass tube
x
Measuring point with the best correlation
between cold-spot temperature and
ambient temperature
Lamp etch
T5 FH28W (nearly constant power supply): Luminous flux / Voltage - Horseshoe
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
55% 60% 65% 70% 75% 80% 85% 90% 95% 100%
relative lamp voltage
re
la
tiv
e
light output
COLD SPOT temperature
50°C 45°C
40°C
35°C
30°C
25°C
15°C
90°C
85°C
80°C
75°C
70°C
65°C
60°C
55°C
5°C
10°C
0°C
20°C
ambient temperature
-5°C
75°C
25°C 35°C
45°C
5°C
-25°C
55°C