Hi Marc - hope all is well and you're enjoying the HH.
I have been pondering where to mount a light canister lately also, in anticipation of getting a new LED. One thing to note is that more new models are coming out with the screw-down light head being the on/off switch - hence it no longer matters where you mount the battery canister or whether you can reach it or not. This opens up a lot more options for mounting ... if you still had your Optima you could mount the canister between the tanks and hidden away inside the cover like I'm planning on doing!
