Unless things have changed, I have yet to see an LED light that would be very good as a primary light to be used with a gun. I have two. One is an ANOVA that runs on 2 CR123 3v batteries and has 5 LEDs and one is a CMG Reactor light that has one LED and runs on two AAA batteries.
The odd thing about LED light is that it does not seem to shine as far. I know that sounds odd and while the lights look really bright, they do a poor job of illuminating at distances greater than about 10 yards and even then the quality of the lumination is not good.
What I have found LED lights good for is close-up work where you don't want to use a bright flashlight because of the amount of light reflected back at you from whatever you are working on. For example, LEDs are great for reading maps in the car at night. That are good navigation lights to light the path directly in front of you well enough. The are really good for use as a handy light should you have the power go out and need light for an extended amount of time. In other words, these are good when you don't need as much light and you don't need it for seeing off in the distance. The big benefit of LED lights is that they tend to drain batteries very slowly while in use, so they tend to be useful for a much greater amount of time before batteries need to be changed, plus the bulbs last for something like 100,000 hours and so you won't ever be changing one.
