The trouble with a lot of the current led flashlights is that they are effectively sealed units, so that if it stops working you have to throw it away, since it is not possible to replace the led assembly. I have a Surefire 6P LED flashlight which I was able to replace the led with a more powerful led than the original 80 lumen one, however the current Surefire 6PX is a sealed unit one, so I would have had to throw it away if it failed. The same is true for a lot of the Fenix flashlights. I had a TK21 which failed after a couple of years which meant just throwing it away. In this case I accepted it and have replaced it with a Fenix TK15C, which is an interesting flashlight since it has a white led with up to 450 lumens and a red led of 40 lumens and 90 lumen green led (the red and green are useful,since coyotes and deer do not have the cones to detect these colors) . I also have a Fenix PD35 which is a good compact flashlight, however the diameter of this flashlight is not 25mm, so it can be more difficult to use as a weapon light. In this case I used a Surefire M78 flashlight mount which works alright with the PD35. It is possible to buy Surefire PD60 flashlight body clones from companies like Solarforce i.e L2P or flashlights like the L2N which allow you to change the led i.e red, green,white etc. I hope this is of some help to you.