If you've ever been in a room with a flash bang going off you would never have made this thread. Are you in the market to hurt the ppl your playing airsoft with? They can be dangerous and can cause severe bodily harm as well as permanent damage in some cases.
Your one of those guys that wants a 800 lumen flashlight, just don't do it.
Also the fact your surprised they aren't legal tells me you prolly shouldn't touch one anyways, little more research on your part would tell you a great deal about why.