Can anyone confirm what this is? It's attached inside the fitting for a 6-foot fluourescent light tube in my garage. I thought it was the starter at first, but all the starters I've been able to find are much much smaller and have a bayonet fitting at the end. The marking saying "8·4 µF" leads me to think it may just be a *very* chunky capacitor, and the ballast (which is very identifiable because it says "S.R.S. ballast for 1x 6ft. 85 watt tube" on its label) might be a type that doesn't need a separate starter, perhaps.

Not that it really matters now; I've since decided, rather than trying to replace the starter (which doesn't seem to exist) I'm going to replace both whole light fittings and their delicate and malfunctioning fluourescent tubes with four LED light fixtures. Going to add another light switch next to the garage's side door too, because when it's dark it's annoying to have to stumble through the whole garage to/from the only switch which is next to the front doors.