@joe_347V: Those with capacitor are likely CWA, those without HX autotransformer. Even when the core&coil unit look very similar, they work in way different ways (and are not interchangeable): The HX provide only an impedance, so lamp current strongly depend mainly on the actual mains voltage, so require quite tight tolerance of the mains voltage.
The CWA, in the other hand, tend to regulate the lamp current and keep it rather independent on the mains voltage, so the setup is able to operate even with quite large drop on the feed wiring, what is handy in far reaching road lighting.
The drawback of the CWA is higher current crest factor, what cause higher load on lamp electrodes, so a bit faster aging,, so it make sense really only on places with poor mains voltage tolerance.
Sadly the simplicity of an HX trigger the assumption, then this should be cheap product, so the manufacture quality use to be worse then CWA...