Interesting point ... yes, the two heads are physically identical to look at, and there are no identifying labels (I just checked on mine, and even the circuit boards in the head look the same).I am newbie and just bought Olight I20, since head from T-series and I-series are interchangeable, how could I now that the light I bought is really used I-series not T-series?
I ask because when loosen the head slightly the light seem only have 2 level brightness, I gues it were max and medium level, never reach low mode.
They are pretty similar. The reflector is the same, so the only difference in the beam is due to the slightly greater output of the R2 emitter in the I10. The I10 circuit also seems to squeeze a little more power out primary CR123A compared to the T10. So on the whole, there is a very minor minor throw improvement on the I10 compared to the T10 - but I doubt you would really notice the difference in real life. Go with whichever interface you like best.and sorry i forgot to ask which one which one would throw farther? between i10 and T10 ?