ingineria iluminatului - Journal of Lighting Engineering - Prof. Florin ...

H C. ALBU, Liisa HALONEN, E TETRI, F POP
4.1 Luminaire equipped with T8 36 W
fluorescent lamp
A luminaire equipped with a T8 36 W
fluorescent lamp and electronic dimmable
ballast has been tested. The dimming
process was performed using a 1÷10 V DC
signal. The signals were given by a DC
power supply, with set values of: 1, 2.5, 5,
7.5, 10 V DC.
The characteristics of the lamp and the
Table 1 Electric and luminous parameters
Parameter Unit Not dimmed
ballast are:
Lamp: DuraLamp 36 W/830 3000 K;
Ballast: Helvar Electronic ballast EL1x36
W HFC 230-240 V, 50-60 Hz.
The measurement results are presented in
Table 1. Figure 3 shows the amplitude
variation of the current harmonics of the
light source during the dimming process
(a), and the voltage and current waveshapes
(b).
Dimmed 1÷10 V DC
10 7.5 5 2.5 1
Active power W 38 38.1 32.2 21.4 11.5 9.1
Reactive power VAR 7.5 7.4 8.0 8.4 8.5 8.5
Apparent power VA 38.7 38.8 33.0 23.0 14.3 12.4
Voltage amplitude V 232.8 231.5 234.5 234.4 233.6 233.6
Current amplitude A 0.166 0.168 0.141 0.1 0.062 0.054
Frequency Hz 50 50 50 50 50 50
Power factor 0.98 0.98 0.97 0.93 0.84 0.73
THDI % 9.05 9.18 9.33 12.88 18.40 19.01
Luminous flux lm 1750 1750 1450 820 220 83
CRI 85.8 85.8 86.0 86.0 86.0 85.6
CCT K 3000 3000 3000 3000 3000 3000
Luminous efficacy lm/W 46.05 45.93 45.03 38.32 19.13 9.12
(a) (b)
Figure 3 The amplitude variation of the current harmonics of the light source during the dimming process (a),
and the voltage and current wave-shapes (b): voltage wave-shape - yellow; current wave-shapes for the not
dimmed case – blue, and for the mentioned dimming levels (dimmed with 10 V DC - purple; dimmed with 7.5
V DC - light blue; dimmed with 5 V DC - orange; dimmed with 2.5 V DC - brown; dimmed with 1 V DC –
green).
10 Ingineria Iluminatului 2010; 12, 2: 5-22