The ultimate in personal defense lights in the Surefire E2D defender LED. It just feels great in your hand.
The E2D actually defaults to high beam. So as soon as you put your thumb on the button it is on high. You have to let off and go back on again to get it to jump to low mode.
The E1B backup works the same way.
I see. I have actually been comparing the LX2 and E2D.
Rule of thumb: You need at least 80 lumens to effectively blind someone in a low light situation. Now, this is a true 80 lumens (look for the ANSI rating). If it's not ANSI, go with at least 120 lumens. No real need for strobe, but a lot of guys do like it.
Personally, I carry a Surefire E1B back up (mine is silver so I can see it if I drop it). Its small, tough, great beam, momentary on or click on, has a high and low mode. Pocket clip also doesn't ruin your pants. Downside, it wouldn't be that great to hit someone with as it is only a single cell light. It does have a little crenelation on the bezel, but nothing too scary. I make it a point to carry everything we sell at some point, and I keep going back to the E1B.
Most the guys at our shop are into the 4Sevens G5. You can remove the strike bezel and this light is a throw monster. Its been the best selling tactical light over the last year. I typically take one of these or a X7 on any night hikes I do in case I need more power!
The ultimate in personal defense lights in the Surefire E2D defender LED. It just feels great in your hand. If you want to be unique and have something no one else has, Elzetta's are really nice and have some heft to them. You can actually nail in nails with them. 4Sevens, Olight and Jetbeam all make variations of pretty solid tactical lights that will be good choices.