Streamlight 65018 Stylus 11-Lumen White LED Pen Light with 3 AAAA Alkaline Batteries, Black

First, I've found all LED lights that make outragous claims of average battery life of dozens to hundreds of hours is either misleading or totally wrong... no matter what brand or where you bought them from. They either go totally dark in much less than half the rated time, or have gone too dim to even read large print with the light pressed closely to the page. To even get close to half the rated life, skip the alkalines, you must use expensive lithium or the highest capacity NiMi rechargables available on the planet.So they all lie about or misrepresent your actual battery life. I'm sure some of them, if you put the most expensive batteries in the world in them, run the light almost to their rated battery life, if you take them into a fully darkend room, & hold the light to your face, strain your eyes, you will find the LEDs are still glowing very faintly... but that's not useful light.I haven't found AAAA rechargables or lithiums, but you won't need them.This is the only LED light I ever found that doesn't give you bull on battery life. It uses a single LED & 3 AAAA alkaline batteries that can be obtained cheap from many sources. Slightly longer than an oridinary pen, I take it everywhere, & is always with me at work. As an engineer, I've used it several times daily for over 6 months with the original batteries. I thought it might be getting a little dimmer so recently put fresh batteries in it. Although it got brighter, not significantly, so I put the old batteries back in. This light just won't die. Lot's brighter than any keychain light, it's as useful as most big lights. It fell 14' from a ladder onto solid concrete, into puddles, snow, & got paint & glue on it. Using harsh chemicals & scraping to get all the paint & glue off, it still looks & works like brand new. I don't know what they used to paint that light with, but there's not a scatch on it anywhere... no dents yet either. Solid & durable. Your best light will be the one that works when you need it to, & is close at hand. Best $14 I ever spent!Update: AAAA Batteries can be found right here at amazon. Just type AAAA or streamlight in the search box. The streamlight AAAA 6-pack runs $6-$7 & are really alkaline energizers. Also if you tear off the metal around a "copper top" alkaline 9 volt battery with a couple of pliers you'll find 6 aaaa batteries inside. But beware... the AAAAs inside the 9 volt battery have the polarity reversed! So you must put those in your light BACKWARDS. You should also stretch the light's spring out a little for a tight fit & better contact. This won't effect it if you go back to ordinary batteries, just make sure to get the polarity right.

This is just what I was looking for, bright narrow enough beam for the work I'm doing

This is the ultimate slender penlight. Looks just like a pen, nice and bright, ideal for quick peeks under things. I carry it in my shirt pocket for those moments when I need to see where a cable goes behind something or under something.Only downside is that you won't find AAAA cells in the average drugstore or Wal-Mart - you can order them here though.

Fits in my pocket, is convenient and works.

I purchased this light to be used as a pen light at work on the ambulance. Unfortunately this light is much too bright for use as a penlight for checking pupils. I still use this product everyday for assorted other uses. It does work well for finding vein shadows on those hard to stick patients.Pros: It is very bright for its size. The battery last for quite a while, I've had it for approximately 4 months and it is still as bright as day one. The light itself is made of metal and is very strong. I have yet to scratch the finish. Very compact, it is the size of a tall pen.Cons: Too bright for checking pupils. It claims to produce only 10 lumens but is actually brighter than my 60 lumen 5.11 penlight. I understand for most uses that would be a good thing.Summary: This light is a great buy. It is very useful I just found that it wasn't useful for the purpose I intended it for but it has been extremely useful for lighting small places and finding vein shadows. I would still recommend this product to all my paramedic friends.

My 4th one, left batteries in too long and corrosion took over.

I'm an M.D. in the US and I got this to use as an exam penlight for patients in the hospital and clinic. Other posters have commented that it is too bright for that purpose but I vehemently disagree with assessment. If you want a good pupil exam you need a bright light, especially when you're doing an exam around all the halogen lighting in the clinic and hospital, and even moreso when examining inpatients getting frequent IV narcotics with constricted pupils. If you want a good exam and you're actually trying to find an RAPD or real pathology then you need a bright light like this one provides. If you're just shining a light in someone's face so that you document "PERRL" and bill for the physical exam then keep your cheap penlight, but you're likely not getting a good exam. This will likely feel insanely bright compared to your current penlight, but my patient's haven't complained. And if need be you can just shine the edge of the beam into your patient's eye for their comfort, and if there's no response you can keep moving inward to shine all of the beam through the pupil if that's what it takes to get constriction.As far as the light itself, it feels very solidly constructed and I use the plastic/rubbery tip on the end to protect the LED. At first I thought it would bother me that you have to hold down the button to keep it on but it turns out this doesn't create any issues during my examination, and in the rare time that I need it to stay on it's very easy to twist the cap and make it stay lit. Otherwise, not having an on/off switch means that I never accidentally leave it on and burn through batteries.So if you're looking to use this as an exam penlight, I highly recommend it!