Guys please educate me on illuminated reticles. I have experience with red dot sights in 1X scopes, but I have never used an illuminated reticle in a variable powered scope. How much does it really help in a low light situation?? Is that the main reason for their existence?? Does it not blur out the target?? And do you use them in regular light conditions?? How much of the target do they cover up?? Thanks, Tom.