I went thru the mag light mods a few years back and now I enjoy customizing the light completely.
Now, I've got a friend that does the light mods for me as he is better at it than I was and I just don't have time for it anymore.
Here's the list I give people to consider when wanting to purchase a custom 1. Do you want to use rechargeable batteries or primaries? Primaries will reduce the cost of you needing to buy a charger but it will greatly limit the selection of flashlights. The rechargeable batteries are three times the voltage of regular batteries, so you can get a much more powerful flashlight if you use the rechargeable batteries.
2. What size of flashlight are you looking for? I personally own a little more than a dozen that I can show you. He offers lights all the way down to AAA size and all the way up to the size of a toilet plunger.
3. What type of beam will you be wanting? There are basically three to choose from, pencil beam, flood beam or combination. There are other types of flashlights with multiple bulbs that will offer multiple beams patterns within one light.
4. What color of light are you looking for?
5. If you choose a standard white beam, there are multiple tints to choose from.
A. 3000k
B. 4000k
C. 5000k
D. 6000k
E. 6500k
F. 4300k (which is the closest to matching natural sunlight)
The 6000 or 6500 tint will have the most output but it will also have the most glare and things you look at will not appear natural. For example, one of my first flashlights that I got from him was a 6000 K. I was using it while grilling a steak outside in the dark. When I cut open the steak then meet appeared gray and I thought it was fully cooked. After I took the steaks inside, I could then see that they were very rare. I can provide sample pictures of this to help you choose.
6. What type of LED? And how many? There are many to choose from, they will determine the beam pattern and tint.
A. XPG
B. Xml
C. Xhp
D. Mtg
E. Nichia
There are a lot of subcategories of each of the above LED types.
7. After choosing the LED, you can choose to have the LED domes remain untouched, shaved, removed or frosted.
8. What type of driver do you want? Basic? Custom? Or user programmable?
9. Heat control is another area to make choice. If the flashlight won't be used much, you can choose no heat control. If the Flashlight will be used for extended periods of time, you may want to choose to have extra copper installed under the driver to absorb heat away from the bulb and driver.
10. What type of switch do you want? You can choose from forward clicky, reverse clicky, electronic. Then you can choose how many switches you would like to have. Do you prefer to have one switch to turn the lights on and off and another switch to change modes? Or do you want one switch that can do it all?
There are other options like deep water dive light or impact resistant light that can be mounted on firearms with custom pressure switch on off buttons.