Mains voltage LED in IP65 fittings, as Kim says. These use a tight fitting push (and sometimes twist) lens part that goes over the ceiling mounted bulb holding part. I tried, and failed, to find an IP65 fitting with a screw-on lens part. Problem with the push/pull type is, IF a bulb blows (ours were originally halogen, we were down to 2 from 6!)) the force required to remove the cover rocks the fitting in the (generally) plasterboard ceiling and loosens it slightly. Shouldn't be a problem if you use decent quality LED G10's, I used Philips.