It’s important to understand there are many ways and many arguments on what’s best. Weapon light, separate light, how bright? Many of these arguments will never be settled, one thing most can agree on is that you need to do what works for you, not everyone is left handed, not all hands are the same size, and no two people are alike. The best you can do is research and even better is to practice. These are tactics you can practice at home and in your free time, then go live next training or range day. I suggest you give them a look and try a few.