That conversion reflector seems to be made for US market to replace the old sealed ones Honda shipped with the bikes, right?
Comparison vs the old bad sealed unit, not other H4 reflectors. I think Hella is one of the better together with Bosch.
My bike had H4 from the beginning, no conversion needed. I have bought standard European H4 7" reflector before. I have with parking light.
I hope I'll get an explanation what " Manufacturer Restriction: Ref. 12,5" means.