"Intellibeam technology." Sounds like something out of a science-fiction movie, doesn't it? In fact, even hearing about what it *is* you might still think that. I mean, here you have this powerful flashlight. It puts out 600 lumens—plenty of light, right? But if you point it at a car's headlights, it dims on its own? MAGIC!
Actually, it's some pretty sweet science. The SureFure P2X Fury has a built-in sensor and microprocessor array that constantly evaluate surroundings and adjust the beam from 15 to 600 lumens depending on light levels. A quick pointing of the light in dark corners and at overhead fluorescent fixtures indicate the sensors are working as intended—the Fury does indeed regulate output depending on ambient light levels.
Perhaps just as ingenious, the P2X Fury doesn't immediately provide all 600 lumens when activated. Rather, it senses the environment and adjusts accordingly—if activated in complete darkness in enclosed spaces, it will turn on gradually to preserve night vision. No more blinding yourself with a powerful light with this SureFire. If needed, a quick extra click on the P2X will yield full-power brightness, a nice touch.
Also nice is that turning the tailcap slightly will prevent the light from turning on, preserving battery power. At full blast, though, it will still run for an hour and a half; however at low power it's good for nearly two days straight.