Quoted:
If you don't care about increased lock time and an increased possibility of a misfire than it can make the trigger lighter.  A better choice is to get a different trigger.  The Rock River Match trigger is only about $100 if you shop around.  It goes in with no adjustments, and with just the two trigger/hammer pins, and will decrease the trigger force by about 1/2 (about 4.5 to 5 lbs).  Or you could get the Geissele SSA or match trigger for about $170 to $250 respectively, of any of a number of other triggers that will give you a much smoother lighter pull without the disadvantages of the light springs.