Not only is the light to weak, but a much bigger problem is that flaslights of other AI/players are only visible up to 15 meters. If you are a bit further away then the light is no longer rendered and it looks like they have the flashlight off.
I am creating a mission atm where I have AI walking around with flashlights, but you can't see them using it from longer distance so you can not spot the AI by watching moving flashlights, which is really a bummer.
Edit: after observing the active flashlight on AI rifles some more I notice now that I can see them from 50/60 meters away, but the thing is that they turn the flashlight off a lot of times instead of leaving it on permanetly. Not sure what is up with the flashlight, but I hope a dev will check it out for himself. Right now AI still are hard to spot when you are scouting and the AI have their flashlight on, you should be albe to see it from a couple of hundred meters away.
And last note, the flashlight is currently a yellow light, it (preferably) should be a white light (like a car light).