Be aware that you are only going to get ONE shot with the light working- the recoil will break the bulb filament, or the bulb itself. BTW, there are some ultra-bright flashlights on the market now that will absolutely blind anyone foolish enough to be dark-adapted and looking your direction when you push on the endcap (they are like a magnesium flare going off right in front of your eyes) You, of course would close your eyes and look away quickly, so as to retain some useful vision.
These are very spendy, though- $200.00 to almost $400.00, depending on just how big you want to go. They may be an excellent choice for a woman who has to traverse a dark parking lot or garage, and is not armed for some reason.
My wife is getting one for her birthday- she is not allowed to be armed at work, or to have "weapons" in the car. A flashlight looks harmless enough, though. I keep (besides my gun) a 4 D-cell MAGLIGHT on the floor next to my head. Even if the light should fail, it makes an excellent club (hold it by the forend; take a 20-minute lesson in effective use of the short club- it is good for a lot more than an overhand strike, and can easily be lethal).
I have had the same light on mine for almost 10 years now, and have never had to replace the bulb. Turns out it is not an actual "Mag-Lite" but a "Brinkman" instead. It is one of the 6" or so length doodads that takes 2 AA batteries. It is bright enough to light up an otherwise dark room and highlight the aim point, but not as bright as some of the newer LED flashlights.
Also, part of the reason it may have lasted this long is that I have only put maybe 50 rounds through that gun since I have had it. The pistol grip, while being all rambo and everything, is not ergonomically effective ... imagine a hammer smacking you in the soft spot between your thumb and index finger ... the pistol grip forces this area to take the entire brunt of the shock, which can be substantial when you put some 3" 00 Magnum loads thru it, so I am not fond of shooting it other than the annual aim test and cycle.