The RS need higher OCV, as there is no device to generate any ignition spike or so. The consequence is higher losses and/or larger size of the RS ballast for the same lamp power and mains voltage compare to the preheater. Other problem may arise from the ballast factor: In a preheat circuit, the ballast short circuit current is all available to heat up the electrodes before ignition, so it work only with full power ballast. In an RS circuit the heating is provided by separate circuits, so it allow the main arc current to be reduced (to allow the use of common, cheaap tubes even on places, where their full rated light output would be too much, e.g. with home kitchen lights,...), so in other words lower ballast factor. For conversion to preheat it mean, the heating current would be too low, so it would become hard to start.
|
|
|
Logged
|