I'm sure you're right.
T6 seems to be some catch all code word also. UniqueFire (some knockoff?) , AceBeam, OsRam, just to name a few, all put this in their ads. One is a T20 yet also throws the T6 in their ad along with T20. AceBeam also has T20, T25, ...
It must just be the bin code as you...