Sera LED Driver ballast for the operation of the sera LED X-Change Tubes. It is possible to connect several LED Tubes to one ballst. Add the power consumption to do so and select the suitable ballast. Please always take care of the total power consumption of all connected LED Tubes and do not overload the ballast. A broken ballast from overloading is not covered by guarantee. If you not sure please select the next larger version.+ Ballast + Ballast Cable length to the LED lighting: 1.5 m