The reason I find the 4 D Meg LED the best light is because it's the best COMPROMISE, like I said. It's not the brightest, doesn't have the longest battery life, nor is it the easiest to carry or the cheapest, but it's the best compromise between features.
TOO MUCH light, like Surefire lights, tend to ruin your night vision. I've done security long enought to test them all, and I prefer the LED Mag over any myself. It doesn't need to be the brightest. And it has easily long enough battery life. But of course, it's not a 500,000 hour rated thingy either. Doesn't need to be.
It's bulky and not easy to carry, but it's better than a baton and requires one less step to use, and that weight is a BLESSING when you go to unload on someone. The trials where lights have been involved testify to how effective the Mag is as a baton, and I've had police officers tell me the same thing! But they use a baton because it's easier to get on the toolbelt. Plus, the baton is a weapon that requires training. A light is just a light! Defense attorneys don't like it, but hey...!
So again, everything about the light can be improved upon, but all-round, the deal is sealed. It's the best multifunctional light, imo. How can I get a 5 D? I don't they're for sale anymore are they?
And consider the price. Those ridiculously expensive Surefire lights you have to baby and take care of. But if I lose a Mag, it's not that expensive to replace!