Where do you measure the current? Between battery and driver, or between driver and laser diode (NOT RECOMMENDED)?
I'm not familiar with the flexdrive, but I think the input current is NOT = the output current.
Also, remember that every diode has a different efficiency, so the correspondance of mA -> mW might not be the same for your diode.
No, I am measuring the diode current (between the Flex and the diode).
I am not too concerned about the output, I'm just curious as to why I can't put more than 1.2A through the diode.
I tried powering the Flex from my bench power supply, but that was not a happy experiment, I'm sticking to batteries