Mowgli
there are cheaper drivers on the market but the Taskled Flexs are the dogs do da`s for sure.
depending on what battery voltage you want to run off
2 leds in series off a 7.4 volt battery then an Lflex would be the driver
your 2 leds in series but off a > 9 volt battery the the B3flex would be good or even the B2flex
I do have all three drivers in stock
the B2flex will do your 1500 ma leds the full juice while the B3flex will go up to 3 amps