ABT,
The HPR50 should survive on 5 cells. I have found the HPR51 is required for 3x123 setups. It does indeed cast a funky beam because of the squarish capsule. Lots of ringy artifacts. Just to be sure, you might want to have an HPR51 on hand in case I am wrong /ubbthreads/images/graemlins/grin.gif
Wilkey