Are we talking about the Q5 A1 or the newer STainless Steel R2 version? I think you'll get roughly the same output out of both lights, but as the A1 uses an XR-E emitter (I think, it might me XP-E) then it may look brighter as it will have a tighter hotspot and so a higher lux value. The Q-Mini should have a larger hotspot though and edge the A1 for overall lumen output. It also depends whether you'll be using RCR123's or CR123a's..