So as in this picture, say the tv stand the sights are on is a bad guy and you are in a dark hallway or another room that's dark, would you rather have this sight picture or not be able to see your sights at all and have to turn on a weapon light to silhouette them?
[Linked Image from i.postimg.cc]
FWIW, I gave $99 for these Trijicon HD XR sights and mostly chose them for the orange luminescent paint that I see very well in the daylight. The tritium is just a bonus. Dawson's will run you $79 and without a light, you'll be shooting blind, I know cause I have them too. Leaving a light on in strategic places in your home is a good tip that was mentioned here a week or two ago. Playing with these and leaving a light on here and there really opened my eyes.