The Nite Ize L.E.D. Upgrade fits any Mini Maglight, and is manufactured in China for this Boulder, Colorado based company. It replaces the standard bulb with a 3 LED insert and a new reflector, that can not be focused like the standard bulb, but none the less is very bright.
The manufacturer claims that it extends the battery life by a factor of 4x, thereby saving the user money. They also claim a 10 year life or 100,000 hours of continuous use.
The unit contains very easy to follow instructions on the rear of the packaging.
It should be pointed out that replacing the original Maglight bulb with the Nite Ize LED replacement voids the Maglight limited lifetime warranty.
So much for the information on the unit, and now for the test results.
Conversion is as easy as they show in the instructions, although the hardest part is getting the Maglight front screwed back on. It is recommended that one saves the original bulb and reflector, although chances are one will never revert back.
The light from the unit is a clear white light although one can argue that this is an upgrade or not. What is indeed valuable about this conversion kit, is that one can take batteries that no longer will operate a GPS and put them into the unit and still get more valuable time out of these semi spent batteries, which is not the case with the original bulb, or at least one will get less useful time out of the original bulb.
Comparing the light output is a bit tricky since the original can be focused, and the Nite Ize LED cannot, but by adjusting the original bulb to the approximate size of the Nite Ize LED we can make some reasonable comparisons.
So first, AA batteries that would barely light the original bulb, producing just a faint glimmer, produced useful and meaningful light from the Nite Ize LED head, and did so for more than 2 hours. When measured after 2 hours, the voltage of the two batteries was 0.6 volt and 0.4 volt, and yet it was still producing a useful amount of light, although obviously not as bright as new batteries, one could still navigate in the darkness with the light. Remember this is approximately 1/3 of the original 3 volts that 2 new AA batteries would produce.
When compared with newer AA batteries it is obvious that the original bulb produces more light, when focused down to a spot. However when opened up to create more of a flood I.E. covering a similar area to the Nite Ize LED, it had the typical darker area in the center with a lighter ring around it, where on the other hand the light from the Nite Ize LED is a much cooler light (more blue content) and very even across the center of the pool of light it produces, with a gradual falling off towards the edges.
So, in conclusion, if you do not need the focusing ability, and are comfortable with the cooler light, and are looking for longer battery life, then this modification is for you!
As mentioned previously, a backpack trip that allows you to use the same batteries that are in your GPS for the your Mini Mag light/Night Ize flashlight, once they are no longer useful in the GPS is a tremendous savings in weight and cost.
Needless to say this is the flashlight of choice for this writer.