Don't even go there with the LED theory Kev....they look like 'gas burners' and are not bright at all....been there, done that sort of thing . The inverters (or ballasts as you call them) have problems if you don't waterproof them from moisture, hence why they overheat and short out due to water ingress. The old connectors on them were not that great either. Now the Gen V version of CCFL's have inverters that are completly water tight and are safer than the Gen 1's, which I fitted to my car a few years ago. Although, I did change to better inverters a couple of years back .