Fluorescent lamps: Difference between revisions
CleanUp2016 (talk | contribs) (Cleanup_2016) |
(cleanup_2016) |
||
Line 26: | Line 26: | ||
|- | |- | ||
! rowspan="3" | Arrangement of lamps, starters and ballasts | ! rowspan="3" | Arrangement of lamps, starters and ballasts | ||
! rowspan="3" | Tube Power(W){{TabRef|Tab1008|a}} | ! rowspan="3" | Tube Power (W){{TabRef|Tab1008|a}} | ||
! colspan="3" | Current (A) at 230 V | ! colspan="3" | Current (A) at 230 V | ||
! rowspan="3" | Tube Length (cm) | ! rowspan="3" | Tube Length (cm) | ||
Line 33: | Line 33: | ||
! rowspan="2" | Electronic Ballast | ! rowspan="2" | Electronic Ballast | ||
|- | |- | ||
! Without PF | ! Without PF correction capacitor | ||
! With PF correction capacitor | |||
! With PF | |||
|- | |- | ||
| rowspan="3" | '''Single tube''' | | rowspan="3" | '''Single tube''' | ||
Line 76: | Line 74: | ||
| 150 | | 150 | ||
{{TableEnd|Tab1008|A6|Current demands and power consumption of commonly-dimensioned fluorescent lighting tubes (at 230 V-50 Hz) | {{TableEnd|Tab1008|A6|Current demands and power consumption of commonly-dimensioned fluorescent lighting tubes (at 230 V-50 Hz) | ||
|a|Power in watts marked on tube | |a|Power in watts marked on tube}} | ||
}} | |||
== Compact fluorescent lamps == | == Compact fluorescent lamps == | ||
Line 110: | Line 107: | ||
| 21 | | 21 | ||
| 0.170 | | 0.170 | ||
{{TableEnd|Tab1009|A7|Current demands and power consumption of compact fluorescent lamps (at 230 V - 50 Hz) | {{TableEnd|Tab1009|A7|Current demands and power consumption of compact fluorescent lamps (at 230 V - 50 Hz)}} | ||
}} | |||
{{footnotes}} | {{footnotes}} |
Revision as of 16:56, 16 November 2016
See also "Lighting circuits" for more details
The power Pn (watts) indicated on the tube of a fluorescent lamp does not include the power dissipated in the ballast.
The current is given by: [math]\displaystyle{ \mbox{Ia}=\frac{\mbox{P}_{\mbox{ballast} }+\mbox{Pn} }{\mbox{UCos}\varphi} }[/math]
Where U = the voltage applied to the lamp, complete with its related equipment.
If no power-loss value is indicated for the ballast, a figure of 25% of Pn may be used.
Standard tubular fluorescent lamps
With (unless otherwise indicated):
- cos φ = 0.6 with no power factor (PF) correction[1] capacitor
- cos φ = 0.86 with PF correction[1] (single or twin tubes)
- cos φ = 0.96 for electronic ballast.
If no power-loss value is indicated for the ballast, a figure of 25% of Pn may be used.
Figure A6 gives these values for different arrangements of ballast.
Arrangement of lamps, starters and ballasts | Tube Power (W)[a] | Current (A) at 230 V | Tube Length (cm) | ||
---|---|---|---|---|---|
Magnetic Ballast | Electronic Ballast | ||||
Without PF correction capacitor | With PF correction capacitor | ||||
Single tube | 18 | 0.20 | 0.14 | 0.10 | 60 |
36 | 0.33 | 0.23 | 0.18 | 120 | |
58 | 0.50 | 0.36 | 0.28 | 150 | |
Twin tubes | 2 x 18 | 0.28 | 0.18 | 60 | |
2 x 36 | 0.46 | 0.35 | 120 | ||
2 x 58 | 0.72 | 0.52 | 150 |
[a] Power in watts marked on tube
Compact fluorescent lamps
Compact fluorescent lamps have the same characteristics of economy and long life as classical tubes. They are commonly used in public places which are permanently illuminated (for example: corridors, hallways, bars, etc.) and can be mounted in situations otherwise illuminated by incandescent lamps (see Fig. A7).
Type of lamp | Lamp power (W) | Current at 230 V (A) |
---|---|---|
Separated ballast lamp | 10 | 0.080 |
18 | 0.110 | |
26 | 0.150 | |
Integrated ballast lamp | 8 | 0.075 |
11 | 0.095 | |
16 | 0.125 | |
21 | 0.170 |
Notes
- ^ 1 2 “Power-factor correction” is often referred to as “compensation” in discharge-lighting-tube terminology.
Cos φ is approximately 0.95 (the zero values of V and I are almost in phase) but the power factor is 0.5 due to the impulsive form of the current, the peak of which occurs “late” in each half cycle