I bought a Sure-Fire flashlight and both the red and blue lens covers. It works great and is much brighter than a regular light without the bulk of those huge candlewatt lights. I use the red lens for walking in and out of the woods and the blue light for blood tracking. I have to admit that I haven't really needed the blue light so far as the blood trail was good but the light made the blood stand out more in low light conditions.

Anyone have any experience with the green lights instead of red for walking in the woods without alarming game?