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

4.4 LED 62 W luminaire
The LED luminaire is manufactured by
GreenLux (62 W GLP 6060-30 Lighting
Panel), and it is driven by a PWM driver.
The dimming levels (2÷8) are appointed by
manufacturer, and the selection between
different levels is done with the use of a
remote control. The measurement results are
presented in Table 4. Figure 6 shows the
amplitude variation of the current
harmonics of the light source during the
Office lighting with old and new light sources
dimming process (a), and the voltage and
current wave-shapes (b).
As the light output is decreased, the
current amplitude, the active power, the
apparent power, the reactive power and the
power factor have lower values. The
increased values of THDI are due mostly to
the decrease of the fundamental current
harmonic amplitude - Figure 6 (a). The
voltage level, CRI and CCT do not vary
during dimming.
Table 4 Electric and luminous parameters at different dimming levels
Parameter Unit
Not dimmed
1
Dimming levels, set by the remote control
2 3 4 5 6 7 8
Active power W 62.3 48.4 35.8 27.7 18.7 9.5 7.4 0.7
Reactive power VAR 19.2 18.5 17.8 16.1 14.5 12.8 11.5 6.8
Apparent power VA 65.2 51.8 40.1 32.1 23.7 16.0 14.0 6.8
Voltage amplitude V 230 230 230 230 230 230 230 230
Current amplitude A 0.283 0.225 0.174 0.139 0.103 0.07 0.06 0.03
Frequency Hz 50 50 50 50 50 50 50 50
Power factor 0.956 0.93 0.89 0.86 0.79 0.60 0.54 0.10
THDI % 11.45 15.85 18.61 26.20 37.37 41.58 40.31 0.40
Luminous flux lm 3460 2840 2200 1700 1150 530 400 0
CRI 56 56 56 56 56 56 56 -
CCT K 3000 3000 3000 3000 3000 3000 3000 -
Luminous efficacy lm/W 55.54 58.68 61.45 61.37 61.50 55.79 54.05 -
(a) (b)
Figure 6 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-shape for the not
dimmed case (level 1) - dark blue, and for the mentioned dimming levels (level 2 - purple; level 3 - aqua blue;
level 4 - brown; level 5 - orange; level 6 - green; level 7 - blue; level 8 – white).
Ingineria Iluminatului 2010; 12, 2: 5-22 13