I knew the reason why my A140s were " freaks" at 850mA.
I apologize for the data of A140s and for my illiteracy.
Standard blue test load uses 6 of 1N4001s and 1ohm resister.
And the voltage drop of A140 is known as 4.1V.
I set the current with this test load.
But the voltage drop was not 4.2V(0.7 x 6), but 5.2V including the voltage drop from 1 ohm resister(1V). I didn't know this at that time.
So my "true" current may be way over 850mA.
Relatively low current setting doesn't matter the reading, but the higher the current, the bigger the error.
And one more thing, maximum forward current of 1N4001 is 1A. So if the setting is near 1A, 1N4001 will produce more heat and act like more resister and will cause more voltage drop.
I made 2A test load yesterday:
http://laserpointerforums.com/f51/dummy-load-high-current-2a-test-load-52372.html
And I am waiting my next A140 on its way, I will bring more accurate readings from the next building....
Again sorry for a terrible amateur.
SHIN