That Spartan drops quite considerably. What temperature was the laser at and was it mode hopping?
Started around 74*F. I did a bunch of LPM runs. There is a narrow temp range that this laser seems to prefer. I wish this laser had a momentary button due to its power curve. It's output never levels out it's a roller coaster. I will do longer tests with half charged batteries this evening to see if it is the driver cutting current due to heat.