Here's a smart quick tip for when you're using a tac light.
If you have a tac light you probably didn't think about this little problem. It's not like you practice shooting in a confined and dark area that's just not safe. While they are vital and I would have rather have one than not the video below illustrates one downside of using a tactical light.
This video could be a life saver, as I would have never thought to test fire in a confined area, in the dark, with a light. Being the large problem that it is the solution is remarkably simple. Move and shoot, the USCCA even teaches classes on this concept.
Even easier would be to switch to a laser sight. I don't recommend this if you don't live alone; it's kind of important to know what you're pointing a gun at.