It isn't the A6 that makes the magic. It is the driver and emitter. If you are needing small....Get yourself an X6 and install this driver. If it must be a tube then get an S2 with an SMO reflector from Mountain or Simon. As a matter of fact...Mountain (RMM) will have whatever you need to fit the bill.
BTW...If you like the A6 then you need to be signed up for the X6v2/X5 sets (as stated above)