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Streamlight 66318 MicroStream C4 LED Pen Flashlight

4.7 out of 5 stars 2,019 customer reviews
| 60 answered questions

Price: $17.95 & FREE Shipping on orders over $49. Details
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  • Features a super-bright, high-flux, 1/2-watt LED and has a lifetime of up to 30,000 hours
  • Consists of micro optical system that facilitates optimized output and run time
  • Waterproof construction with an unbreakable polycarbonate lens as well as pocket clip
  • Ultra-compact at 3-1/2 inches in length
  • Features a tailcap switch for simple one-handed operation
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$17.95 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

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  • Streamlight 66318 MicroStream C4 LED Pen Flashlight
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  • Streamlight 66118 Stylus Pro Black LED Pen Flashlight with Nylon Holster
Total price: $37.80
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This item: Streamlight 66318 MicroStream C4 LED Pen Flashlight
Customer Rating 4 out of 5 stars (2019) 4 out of 5 stars (3640) 4 out of 5 stars (568) 4 out of 5 stars (5279)
Price $17.95 $19.85 $10.97 $37.39
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Amazon.com Amazon.com Amazon.com Amazon.com
Batteries Required Y Y Y Y
Power Source Battery-Powered Battery-Powered Battery-Powered Battery-Powered
Item Weight 0.13 pounds 0.1 pounds 0.01 pounds Information not provided
Length 3.5 inches 5.3 inches 4.02 inches 5.91 inches
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Product Description

Visual LED bar graph indicates the presence of voltage. The higher the voltage sensed, or the closer to the voltage source, the more LEDs light up. Bright flashlight illuminates work area and may be used independent of voltage detection function.

Product Details

Product Warranty: For warranty information about this product, please click here. [PDF]
  • Product Dimensions: 3.5 x 0.6 x 0.6 inches ; 2.1 ounces
  • Shipping Weight: 3 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B00143JZ08
  • Item model number: 66318
  • National Stock Number: 6230-01-583-9046
  • Average Customer Review: 4.7 out of 5 stars  See all reviews (2,019 customer reviews)
  • Amazon Best Sellers Rank: #420 in Home Improvement (See Top 100 in Home Improvement)
  • Product Warranty: For warranty information about this product, please click here. [PDF]


From the Manufacturer

The MicroStream LED pen light features powerful LED technology
Streamlight MicroStream C4 LED Pen Flashlight

The MicroStream is a compact single AAA alkaline battery powered LED flashlight designed for use in all markets. It features a push button tail cap switch, momentary or constant on operation, a combination pocket/hat clip for convenience, and amazing brightness and run time for a light of its size and price. The aluminum housing with Type II Military Spec anodizing helps make the light extremely durable and abrasion resistant. Utilizing the latest C4 LED technology, this ultra compact and lightweight flashlight is optimized for output and run time.

Additional Features
  • Most models meet applicable European Community Directives
  • Includes battery and unbreakable, removable pocket/hat clip
  • All openings are O-ring sealed
Output and run time
Bright and Powerful LED Technology

Featuring C4 LED technology for extreme brightness and shockproof with a 30,000 hour lifetime, the MicroStream LED pen light provides up to 683 candela peak beam intensity, 28 lumens, and a beam distance of 52 meters.

Powered by one AAA alkaline battery (included in purchase), the MicroStream LED pen light has a run time of 2.25 hours.

Built to Last

Built for durability, the MicroStream LED pen light features a corrosion resistant machined aluminum alloy case with a Type II MIL-Spec black anodized finish. Its unbreakable and scratch resistant polycarbonate lens is O-ring sealed. Rated IPX4 for water resistant operation, the MicroStream is also 1-meter impact resistance tested.

Weighing 1.04 ounces with the battery (included in purchase), the MicroStream LED pen light measures 3.5 inches in length with a body diameter of 0.60 inches.


Important Information

Brightness
28

Wattage
18.00

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Marty Jones on March 2, 2009
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.
14 Comments 309 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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As a Police Officer for nearly 18 years now, and just about all of that time spent on 2nd shift, in the same Beat, I have had many flashlights over the years, but none have compared to the versatility of the Microstream from Streamlight!! This has been my favorite flashlight, Hands Down!! It has very good output for its size and one of my favorite things about this little light is that it takes a AAA Battery, instead of 3 or 4 of those little watch batteries, or some other off size battery that is difficult to find. The "S" Clip is also a Great addition to this light!! I can clip it on my pocket and take Reports at night, or clip it on my hat when walking through the woods looking for a lost child. I also use it to search under seats of cars or in tight spots. It is really great for finding fingerprints on windows too!! I have also accidentally ran my through the washing machine several times over the past couple of years, and it keeps going, and going, and going...Whenever a Rookie Officer is assigned to work in my Beat with me on a daily basis, I always buy them a Microstream as a "Welcome to the Hood" gift, and show them how useful this light is, because I know that they will get as much use out of this light in their career, which is just beginning, as I have got out of it during my career, so far...I Highly recommend this light for anyone who is looking for a small, versatile, reliable, powerful, little light!! Oh...something else that I have not seen anyone else mention yet...I believe that all Streamlight Flashlights come with a limited Lifetime Warranty, which covers everything except the battery and signs of abuse!!
6 Comments 170 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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I've had this light for about a week. I bought it with the intention of leaving it in my backpack (a smaller replacement for an aging mini-maglite). Well, the maglite is still in my backpack- the streamlight stays in my pocket. It is small and lightweight enough to be carried un-obtrusively. I'm amazed at how bright it is, and everyone who has seen it has wanted one. Great product, great price.

Update- six months later- still love it, probably more now than when I wrote the initial review. I use this daily, for so many things it's really hard to describe how functional this light really is, it's great!
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Verified Purchase
I really like this light. It is compact and can be worn in a front shirt pocket like a pen and has a "pen" clip for this.I actually wear it in the right corner of my back right pocket again taking advantage of the pen clip and it does not interfere with taking my wallet in or out.

It has a very, very bright white light which you can use with a momentary push of the on/off button on the end of the light (like a clip pen) or turn it on continuously by fully depressing the end of the pen.

It is a well tooled piece of equipment with a flat black metal finish that while not coarse is not slick either so is easily gripped and handled.

It uses a single AAA battery and has a reportedly long battery life.

I have not exhausted the first triple A battery yet despite using it often in the last month plus I have had it.

I really like it and plan to purchase one for both my son, daughter and father.
3 Comments 81 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
Well, just received the flashlight today. I am going to rate this review as 4 out of 5 stars because this being a initial review. Product came on time, no defects. pretty excited, because I have a stream light (weapon light) on my 1911 as well. I will say that stream light put the "M" in micro on this one. Definitely small, but construction looks and feels solid. Yes this is a non-adjustable light, but the LED and lumen on this light make up for it. Did a small in-house room clear and quite frankly the light does just as a good job as my surefire G2! This light retains the widely used thumb switch on the end of the light. One click for continuous light, slight press for select lighting.
This light could be used with a pistol combo (concealed carry), but hand size will determine overall effectiveness. Otherwise this is a great light for in the car, key chain (lanyard included), tool box, hunting jacket, bedside light as well. The only CON I felt towards this light was the price, but I think most went to the name. This light has a good/stable pocket clip that fits nicely in coat pockets, pants of any kind. Lanyard maybe to much for normal usage, but it may work better in low light situations during hunting season.
I read about 50 reviews on this light, and some have reported that the light would stop working all together or the pressure switch on the end gets funky. I guess we'll see in the future, but for now I remain hopeful mine will provide years of service!

Please see my pics for scaling purposes- (1) pic is with a Surefire G2 and (1) is next to a standard sized chap-stick
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