Re: Bayonet? - Why not a bayonet cap option?
Extra low voltage halogen is a lot more efficacious than 230V halogen. The filament is also a lot stronger so handles shock better.
And extra low voltage LED is usually more efficacious and lasts a lot longer than the 230V versions as well. It's the power supplies that die on those.
Unless you're switching to Florey tube, you're better off sticking with the 12V halogens and just making sure you get the really wide beam angle lamps.
The narrow ones are very common, and utterly pointless!