From a random cr123 data sheet , The cr123 draws 1. 5 amps at 2 volts. The voltage for two cr123 in series should drop well below 4v while trying to drive a ssc p7 at 2..8 amps.
Do you agree or,disagree? I thing the arangement should put out about 6w or 500lm.
but thats a guess.
Thankyou