Are yopu sure that tritium can be 'recharged' with sunlight or even a bright light? I'm not a chemist but I think that is radium you're thinking about. I think the technical word for that sunlight recharging was described as 'as dim as a toc H lamp'

We used to practice dawn-to-light and dusk-to-dark shooting in training for/with 8 RAR going to SVn in 1969. We heard about the new Hythe backsights and the 'new' foresights that you would twist to suit the larger rearsight aperture but never saw one until I got back to Englandicon.

Maybe Muffer can tell us when they came on stream in Australiaicon. I don't know what the ratio for Hythe v normal sights was but the usual REME ratio was probably 0% Hythe, 100% normal!