"As part of your Every Day Carry (EDC) kit, you need a good light to keep the dark at bay, confuse an assailant, or find your way through over uneven terrain or dark alleys. I have been using the ASP Dual Fuel Guardian for a month now, it is small enough to keep in my front pocket and pushes out over 430 Lumens; that is a ridiculous amount of light for a small pocket-sized light. I used this light on and off for a full month and only one time did I have to switch out the primary battery for the ASP AA replacements, for only a short period of time. "