I own many flashlights, and this is by far my favorite using a 1xAAA format.The brightness is exceptional for the size and weight.I believe the 20-lumen rating is accurate, by comparison with many other lights I own.I also own the larger 2xAAA version of this light (Streamlight Stylus Pro), and the microstream is almost identically bright.Of course, the 2xAAA version has longer battery life, by more than a factor of 2 because of circuit efficiency and battery-capacity variance with discharge rate.The switch type is my favored "forward" clicky, which means you can push it slightly to get a momentary-on function.Some other lights use a "reverse" clicky, which doesn't turn on until you click and release.
The one thing I dislike about both of these lights is that the pocket clip rotates with the threaded end cap, badly scratching the finish when you remove the cap to replace the battery.You can avoid this by placing a piece of cloth between the clip and flashlight body before turning the cap, but you have to think of this before first disassembly or it's too late.
Also, the clip exerts enough sideways pressure on the light body that you must be very careful to avoid cross-threading when you reinstall the cap onto the body.
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Product Description:
The Streamlight MicroStream LED Penlight features a rugged construction to provide you with one durable little light! This mini flashlight features a bright LED light. An abrasion and corrosion resistant anodized aircraft aluminum construction combined with an internal polymer body liner and a shock proof switch housing, ensure your Streamlight operates under the most extreme conditions. Its also waterproof, shockproof, and drop tested! The Streamlight includes a push button tail switch, a pocket clip, key ring, and a safety lanyard for maximum convenience.
