Thanks for checking. 17mm would be great, indeed 
But apparently there are some different versions of TG06S…
On AE there is information that it is 300lm light, which would suggest that this is TG06 version (without “S”), but in customers’ pictures it is visible TG06S marking on the box:
Another interesting thing is that in other review driver seems to be 12mm.
So I don’t know which version is currently sold.