Needed something I can read at night with (for referring to astrology books while looking at the stars) and not hurt my night vision as well as finding things in my purse/bag. Perfect, bright, and small. No complaints here.

Bought both the Photon Micro-Light II and the Princeton Tec Pulsar II (3 of each) as Christmas stocking stuffers last year. The Princeton Tec's were a big disappointment; they are useless now. The Photon Micro-Lights are still as bright as they were Christmas morning.

I needed a pocket flashlight that I wouldn't lose or forget to bring with me. I decided that something on my key chain would fit the bill. This Photon micro-light is great. It has a really bright beam and the quick connect that secures it to my keys is very easy to use. A good tool to have with you.

I liked it so much I bought a second one. Small, very bright. But small plastic switch to turn and keep light on would be very difficult for someone with arthritis. I struggle with it myself sometimes.

I love this powerful little little flashlight! It is easy to carry around unobtrusively on a key chain, and with its on/off switch it is a versatile, cost effective tool. Although I am pleased with my initial purchase, when I ordered four more of these for family members...I found a much cheaper price outside of Amazon.

Please beware that you can get almost the exact same light but with 22,000MCD LED's in a 10 pack for under $5 including shipping. I won't name the vendor but they are out there. I am irritated that this vendor is participating in highway robbery.

I moved back to my mom's house after having my baby. I live in the basement with my husband and daughter. We have a separate entrance around back. There is no light in the back yard. I didn't want to spend a lot of money to contract an electrician to hook up the lights so I started looking for another alternative. I came across this item and was pleased by all the positive reviews and purchased the flashlight. All I can say is wow. How can something so tiny radiate so much light. We will be satisfied with this buy.

I've had one of these Photon Micro lights for several years and it was time for a new one. I've owned several micro-lights and the Photon is my favorite by far. I like the new switch that lets you turn the light on and leave it on; I hiked several miles in Big Bend National Park one night by the light of the old one and my hand got very tired holding down the button! The good news was that the Photon light gave very adequate light to see the trail after my larger light failed. My other light was white; the red is good for not interfering with night vision and is still very bright.

I've only owned and used the Photon Micro-Light II Keychain Flashlight for about a month so this may be a bit early for a product review but here goes. So far - the key chain light is every bit as good as advertised. It's amazingly bright for it's size. It's very small and light (pun intended) which is nice. Prior to this keychain light I purchased 2 Brookstone keychain flashlights which both quit working within a month or so after using them. I'm much happier with the Photon Micro-Light. My only negative comment is that the small switch on the light does not switch the light on and off without holding it open. But this will probably prevent it from accidentaly going on while it's in my pocket which may be a good thing. Based on one month's use I would definitely recommend this product.

My only complaint is that the light will not stay on unless I continue to press the button, which is not easy to do for more than a few seconds.

I bought this light a few months ago and have been very pleased. I used to have a traditional AAA battery filled mini-maglight for many years, but it finally got lost and I decided to replace it.

What immediately intrigued me (besides all the positive reviews on Amazon) was that it was much smaller and less bulky than my maglight. I could hook it to my keychain without feeling like I was carrying a bulky set of keys and accessories...

Don't be fooled by cheaper lights -they won't be as bright as this. I have used it to light my way through dark alleys, and to find something in darkened rooms). You never know how much you need instant light until the one time you really need it and don't have it...

I think it would make a great present for a loved one. For a guy, it is cool, and useful. For a gal, it is tiny, and unobtrusive, and can fit in the smallest purse...

There is also a mini on/off switch which you can use to keep the light permanently on -this is a nice feature which I haven't had to use yet.

The only drawback is that the price is high, but it is what it is... I'd buy it again.

I've had mine for about 4 years. I use it for walking at night so that the oncoming cars can see me. It has a little hold switch to keep the light on, so you don't have hold the button down the entire time. It is extremely light weight, and the battery and bulb are still the originals from 4 years ago.

This s perfect for the key chain. I first learned of the Micro Light when I went to an Army Base. Everyone uses them to see when "lights are out" - nice option to lock the light on vs. the I model. Highly recommend this light - bright and long lasting. The industry standard in my opinion.

I purchased the Photo Micro light a few weeks ago. The light produced was surprisingly bright. The small size is ideal for a key chain. Its basically an adequate flashlight that you can carry with you at all times. Far brighter than the cheap key chain lights sold in many stores. Also much brighter than the most popular alternative, the cell phone. Very happy with it so far.

This is a great little flashlight. Since I have it on my keychain, it's instantly available (no searching for a flashlight). I use it daily. The switch for locking the light on makes this one superior to the "squeeze only" version. The light it bright, and the two CR2016 batteries last for months. Changing the batteries is a little bit of a nuisance - you need a very small Phillips screwdriver and the procedure requires careful fiddling, but I change them so infrequently that the annoyance level is pretty low. I still give it five stars. Those less mechanically inclined might skip the battery change and just replace it.

I am happy with this item. It is the brightest keyring light I've ever had, and has had a number of semi-hard knocks and keeps on glowing.

I bought the Photon II to replace an older key light, and it's sooo much better! It produces about as much light as my much bulkier 2D Maglite.

The button has the ideal pressure threshold to activate easily but not accidentally. The constant on switch is often handy, but it did require an unreasonable amount of force to activate until I operated it a few times. I don't know whether it's normal for the switch to have to be "broken in" like this or if it was a sample defect, but it works fine now.

The Photon II is pricey compared to other key lights, but if you use it anywhere near as often as I use mine, then you'll be glad you spent the extra couple of bucks.

I bought one of these at an Eastern Mountain Sports a few years ago. I thought the price was a little high at fist, but that went away after I got to use it.

It is very bright, I had the original battery in mine still after 3 1/2 years, but it was getting low. Replacement batteries are only about $3 for a good one.

I have purchased some of the generic keychain lights for other people as gifts, and none of them were nearly as bright as this one.

I lost a set of keys with the Photon II attached so I need to replace it, I wouldn't be hunting down the exact model again if I was not happy with the last one :)

I bought 4 of the Photon II Micro Keychains for Christmas presents this year. They are surprisingly bright for such a small bulb. The light is also not just a tiny pin point of light but can light up a small room or two car garage enough to make everything reasonably visible. I also bought one for myself. No more fiddling around with the house keys after dark because I forgot to turn on the front porch light. Although I have not changed the battery since it's new, it seems relatively easy to replace the battery should the need arise. The price of the photo II may seem expensive in comparison to other LED keychain lights, however given the durability and lifetime warranty, the photon II is a bargain.

This is a tough little light. I've used mine for years without any problems. I take it everywhere on my keychain and don't even notice it's in my pocket. Very, very usefull!

You can find keychain flashlights on eBay for $1, but they are ridiculously inferior to this light. I've had mine for a month, and already used it several dozen times. I didn't know how handy these were! These Micro-Light II's use the newer Nichia LED's, which are twice as bright as normal LED's, but use the same amount of power (so these easily outshine most other keychain lights)... It isn't as bright as a hand-held flashlight, but you can easily use this for walking at night if you don't have access to a larger flashlight. The on/off switch also works great and does not accidentally turn on while in my pocket. I really have nothing to complain about this product, except that the price may seem high. In this case though you do get what you pay for. The batteries are two 2016 Li-Ion watch-sized batteries and are easily available at your local mega store or mall.

Beware that these are not very water resistant! I don't think water will permanently damage them, but you may not be able to get a light out of it while it is wet since seems to be no waterproofing on the case.

For years I have used a small keychain flashlight. The main problem was that the light was not very bright and the battery drained quickly.

I was looking for a replacement light when I cam across the PhotonMicro-Light II keychain flashlight. I am in law enforcement and use a high end 20,000 candlepower flashlight daily. So, fair or not, any flashlight I use gets compaired to that light.

The Photon kychainf is amazing. It provides an unobstrusted light which lights up the sidewalk, darkened doorways and provides good lighting to eliminate shadows for about a 20 foot range.

I particularly like the switch feature which I use fregurently while I fumble for keys in the dark.

These lights are simply the greatest -- very bright, long battery life, extremely small, and virtually unbreakable. I keep one on my keychain, one at home and one at the office. They are cheap enough to have a few. This brand is also the best in terms of build quality. I've compared the CompUSA ones, but these are the only ones used by NASA. . .

As a Scout Leader, I have searched for the handiest light source available. The Photon II, although pricey comes awful close to perfect. It's small, much brighter than you'd expect, and you can take it anywhere.
It is especially effective inside the tent---I tied mine to the loop at the top and it filled the tent with enough light for conversation. It makes a great reading light, if you don't mind holding it in your mouth, and it is especially helpful late at night when nature calls.
Good feature is the snap on/off switch--so you don't have to keep applying pressure to the switch.
Bad feature is also the snap on/off switch. If you put it in your pocket on a keychain, sometimes it gets switched on and that runs down the batteries.
A powerful flashlight is the tool of choice for nighttime trail walking, but in a pinch you could use this little guy.
It's also handy around the house or in the car---anywhere you need a dependable source of light.

This review is really about a better alternative to the Photon-II - the Inova Microlight. I purchased the Inova at CompUSA after doing some quick research on the net. The Inova is just as small as the Photon-II and in my opinion is a better design.

1) the case is screw-less; no micro screw-driver required for a battery change.
2) the Inova's small slide switch is easier to operate
3) the Inova's LED is recessed into the case and not exposed
4) the Inova's quick-clip is easier to attach than a split-ring.

All this at a price that is 2/3's the price of the Photo-II. (icing on the cake).

The Photon II is a small light that you can keep on your keychain. The light case is a little bigger than a nickel, and it uses watch-size replaceable batteries. The light output is similar to a 2AA MAG flashlight, which is enough to find your way around in a dark parking garage and up or down steps. It's also enough to find the correct key on your keychain and to see the locks on your car, house, etc.

Works well, but similar product can be found for much lower prices.

I have extremely poor vision that gets worse in darkened conditions. I found that this little LED "flashlight" is powerful and extremely useful. It always stays within reach on my key chain, and I use it every night.
The Lithium batteries lasted me for a more than a year of hard daily use before needing to be replaced. It is very useful in when trying to see a menu in dimly lit restaurants, but remember to cover about 75% of the LED, as to not disturb others. People like myself who absolutely need to see in these settings (i.e. diabetics who need to check glucose levels at meal time) it becomes indispensable. The light is extremely useful when I navigate for my wife in the car. The light does not disturb her like the dome light.

I purchased one for a friend who is a pilot, since the red light does not effect his night vision; he now keeps an extra one on hand, just in case.
Other uses:
The red light emitted from the LED, can not be seen by deer, which makes useful for hunters in their stands while waiting for light or as backup for a flashlight.

Auto, boat, camping / hiking emergency or survival kit. The LED can be seen for some distance in the dark if looking directly at the source. If you point the light downward, the illumination is not noticeable.

The only con is that the red light does not give much contrast. I have a green light that provides more contrast, but it's hard on the eyes.

This is a very handy little light that is small enough to carry around in your pocket on a keychain. The LED "bulb" is very bright for its size, more than adequate for finding your way around in a dark spot, reading a map, finding key holes, etc with simple thumb press on the button. It has a small switch that will lock the light in the "on" position. I highly recommend this Micro Light II model over the more expensive Micro Light III. The Micro III has more features, but they aren't that useful and mine used up the batteries in just a few weeks. So I bought a Micro II and have been very happy with it. The battery has lasted several months so far.