I'm going to leave a few more thoughts on this thread because I found it very interesting.
One thing I do not want is for my gun to light up in the dark of night as soon as I run out of ammo! I become a target & I can't shoot back!
The second thing I don't want is to get in the habit of using a crutch I don't need. Particularly something as temporary as batteries. I've pulled thirty-year-old bullets out of the closet and shot them. That's reliability. I had a battery go dead on a device and I believe it was because I accidently pressed the off button 4 times instead of 3, and it came back on after I had put it away.
Now you can look at this situation and say, "Oh well, it would be operator error." And that would be true. The thing is, I am sure that every single one of us is left some device turned on in his lifetime and run the batteries down. People get distracted, they get upset, they get forgetful, they fumble, and good guns are designed on purpose to help you avoid all of these problems.
Just close your eyes and load your gun three or four times and you'll figure out that this light is totally un-needed. If you can't load your gun with your eyes closed I would suggest that you practice until you can.
All that being said there are lots of things on lots of guns that are totally unnecessary and put there by owners who just like them, and for no other reason.
Being that this is America, I don't have a single problem with that. You fix your gun up any way you like. Please don't feel insulted or embarrassed if I tell you that it's not my cup of tea.