The Depos I had on the SDL were very well made. The TYCs on the 300D are poorly made - the brackets that hold the reflectors are flimsy and don't hold adjustment well, the lenses don't seal well against the housings, etc.

TYC lenses have different fluting that your Hellas but I don't know if that means a significant difference in beam. There is a very distinct Z pattern to the TYC beams as I expect from Hellas.

Sixto
87 300D