Red is good for walking in the woods without alerting game (they don't see the spectrum) and conserving your night vision.
Bad for reading maps (it makes everything black and white, and the colors are washed out, you will not see anything painted in red)
Green have more intensity than red, used with night vision to see farther.
Don't know yet how it affects game.
Blue is for following blood trails, in certain mediums it is an advantage (rusty color of leaves in the fall) in others such as green dark vegetation it doesn't come up at it should. It is supposed to make blood trail black and wet, but don't always do.
Best light to follow blood trail in all conditions, WHITE LIGHT.
I went to my dark basement and pricked my finger and took these pictures with red and blue filters and white light.
The light was a Fenix L1P 40 lumens
RED, don't show the blood
BLUE, makes it black
WHITE, now you see it!