Lighting Ballasts

A lighting ballast helps to safely start and operate lamps such as HID and fluorescent lamps. They provide it with the correct voltage for start-up and the running of the lamp.

How do they work?

Without a ballast to limit it is current, within seconds a fluorescent lamp would overheat and burn out. The ballast briefly supplies high voltage to establish an arc between the two lamp electrodes. Once the arc is established, the ballast quickly reduces the voltage and regulates the electric current to produce a steady light output. For more information on how it works, you can consult our complete Lighting Ballasts Guide.

Types of Ballasts

The most common types of ballasts are magnetic and electronic, and they come in several start technologies to suit different purposes.

  • Magnetic Ballasts – These ballasts are located inside your light sockets between the plug and the light bulb and the power cable. They convert mains electricity into a correct voltage to start, make sure that you always match the wattage of the ballast to the wattage of the lamp.
  • Electronic Ballasts – These ballasts alter the flow of electricity in the light bulb by using a series of induction coils that are separated from one another. They change the frequency of the electrical current without changing the voltage. While magnetic ballasts in fluorescent lamps work at a frequency of 60 Hz, electronic ballasts greatly increase that frequency of 20000 Hz. This high frequency ensures you will not see the lights flickering and will not hear a buzzing sound.


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Description Price Wattage Number of Lamps Ballast Type Supported Lamp Shape Supported Lamp Type Voltage Rating Dimmable High Frequency Length Width Height Minimum Operating Temperature Maximum Operating Temperature Dimming Protocol
RS Stock No. 413-055
Mfr. Part No.HF-P 2 14-35 TL5 HE EII
£23.84
Each
Units
14 W, 21 W, 28 W, 35 W 2 Electronic TL5 Fluorescent 220 → 240 V No Yes 360 mm 30 mm 22mm -25°C +60°C -
RS Stock No. 413-065
Mfr. Part No.HF-P 1 14-35 TL5 HE EII
£20.12
Each
Units
14 W, 21 W, 28 W, 35 W 1 Electronic TL5 Fluorescent 220 → 240 V No Yes 360 mm 30 mm 22mm -25°C +60°C -
RS Stock No. 413-061
Mfr. Part No.HF-P 2 24-39 TL5 HO EII
£21.75
Each
Units
24 W, 39 W 2 Electronic TL5 Fluorescent 220 → 240 V No Yes 360 mm 30 mm 22mm -25°C +60°C -
RS Stock No. 544-349
Mfr. Part No.HID-PV C 070I
£18.56
Each
Units
70 W 1 Electronic - Ceramic Metal Halide 220 → 240 V No Yes 188 mm 82.7 mm 35mm -20°C +45°C -
RS Stock No. 243-2904
Mfr. Part No.HFR258TLDII
£56.26
Each
Units
58 W 2 Electronic TLD Fluorescent 220 → 240 V Yes Yes 360 mm 30 mm 22mm +5°C +50°C 1-10V
RS Stock No. 312-3027
Mfr. Part No.BSX3555L82
£31.42
Each
Units
35 W, 55 W 1 Electromagnetic - SOX 240 V No - 196 mm 39 mm 28mm 0°C +75°C -
RS Stock No. 899-7854
Mfr. Part No.HF-P 3/414 TL5 III
£17.72
Each
Units
- 3/4 Piece Electronic TL5 Fluorescent 220 → 240 V No Yes 280 mm 39 mm 21mm -25°C +60°C -
RS Stock No. 243-2897
Mfr. Part No.HFR236TLDII
£56.26
Each
Units
36 W 2 Electronic TLD Fluorescent 220 → 240 V Yes Yes 360 mm 30 mm 22mm +5°C +50°C 1-10V
RS Stock No. 243-2869
Mfr. Part No.HFR136TLDII
£23.04
Each
Units
36 W 1 Electronic TLD Fluorescent 220 → 240 V Yes Yes 360 mm 30 mm 22mm +5°C +50°C 1-10V
RS Stock No. 243-2847
Mfr. Part No.HFR118TLDEII
£60.85
Each
Units
18 W 1 Electronic TLD Fluorescent 220 → 240 V Yes Yes 360 mm 30 mm 22mm +5°C +50°C 1-10V
RS Stock No. 243-2875
Mfr. Part No.HFR158TLDII
£52.16
Each
Units
58 W 1 Electronic TLD Fluorescent 220 → 240 V Yes Yes 360 mm 30 mm 22mm +5°C +50°C 1-10V
RS Stock No. 544-361
Mfr. Part No.HIDPVC150S
£83.92
Each
Units
150 W 1 Electronic - Ceramic Metal Halide 220 → 240 V No Yes 135 mm 75 mm 32mm -20°C +60°C -
RS Stock No. 544-355
Mfr. Part No.PVC070SCDM
£54.63
Each
Units
70 W 1 Electronic - Ceramic Metal Halide 220 → 240 V No Yes 109 mm 75 mm 32mm -20°C +45°C -
RS Stock No. 544-351
Mfr. Part No.PVC035ICDM
£17.43
Each
Units
35 W 1 Electronic - Ceramic Metal Halide 220 → 240 V No Yes 188 mm 82.7 mm 35mm -20°C +45°C -
RS Stock No. 544-339
Mfr. Part No.PVC035SCDM
£63.73
Each
Units
35 W 1 Electronic - Ceramic Metal Halide 220 → 240 V No Yes 109 mm 75 mm 32mm -20°C +45°C -