Yes that would be nice but, I think with a steady hand and a sharp blade you can do it. I have had to lay it on a lens more than once and thought I would mess it up. I took my time and it worked out just fine. I made a really bad looking video of myself trimming a piece to fit a lens on a light that the bezel wouldn’t come off. If I can find where I hid it on Dropbox I will upload it to YouTube and provide a link, and also embarrass myself in the process. 
I thought I answered this the other day it must have been in a PM .
usually I put film on the outside of the lens ,probably because I'm too lazy to open the light or it's a tough light to open ?? anyway I just grab a coin or a battery or you could use a socket from a socket set to trace with a pencil .I use scissors and just try to keep the cut as round as possible and I always default for larger rather than smaller .Since any light sneaking around an edge will show up in the beam . depending on the light you can tuck film under the o-ring with a toothpick .using water under the film letys you move film around a little like when doing auto window film ..Squeeze water out or bake at 10,000 lumens :P
The letter was received very quickly
@ Boaz
Can you tell me what kind of foil you have? A shop here is selling so many different DC-Fix foils. Milky, Opal, Frost. . .with glue and without. . .
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Pm incoming!
Thanks maukka!
Found the one you mentioned. But they also have the Static Premium Milky .
If i have a bit of time next week i want to go to the store and check them both out.
I'm carrying about 5 different types of diffuser film at this point so people can try out different materials used for different diffusion techniques .
I have thinner or thicker ... adhesive and non- adhesive materials
PM me for info
Today I finished DC-Fixing my first light. Folomov EDC-C4.
For me this is a camping light and for that purpose it was too throwy.
Some time ago I cut a new lens from the thickest DC-Fix. It was too thin, so I lost waterproofing. I was not worried because I got some GITD o-rings for the light in the mail already. They arrived today, so I finished the change by adding a second o-ring.
The light is still a little too throwy but much better. Marginally lighter than before as well. Thanks Boaz!
Added DC fix to SC26 today . Nice. A little less throw but way nicer wall of light starting at my feet.
PM’ed with a request for an order.
Hey Boaz. Got a Wuben E05 yesterday in the mail. Great little light and gets plenty bright and nice spacing on the modes. The beam isn’t so great. So after playing with it for a while and really liking the feel and operation I DC-Fixed the little goober. Did a great job of eliminating most of the crazy tint shifts and rings. Made it more floody of course, which I like, and made the light that much more enjoyable. Looking forward to getting my new envelope full of DC-Fix. Like I told you in the PM, I used more of it on friends and family’s lights than I did my own. I have to stock up on what they got off of me. 
PayPal sent for a couple of sheets.
$20 WowTac A2 before and after. I used the film with white backing on this one.
Much improved the bouncy ball effect still has hot spot witch I like.
How does this material stick? Static type laminate or does it actually have an adhesive?
The other I tried had some light adhesive I think, still easy to remove. The white backed stuff I used about doesn’t. I am using the bezel to hold it down.
I just used the Wowtac above for a 3 block ally walk with the dogs. It made my experience, Less busy. Well worth it to me.
I have some of both adhesive and some thicker film without ..Just depends on what you want to use it for .
PM me for info on different film other than Dc-fix .
Hey Boaz. I have had the Wowtac on my head since the mod(minus a quick shower).
I did a driver swap and flashed it with Anduril earlier today. After the driver swap I used it in the basement to tear down another light, and in the garage looking for tools to tear down another light. Oh and I used it to look for my dc-fix. The wife is gone today so I have gotten to play.
I wasn’t sure I was going to keep this until I put the dc-fix on it and took a short walk, I am using it now at the computer.
The dc-fix turned this 5/10 light into a 9/10 light that just might stay.
I think I will dc-fix my NU30 before the wife gets home.
1 Thank
Nitecore NU30 before and after. Used the film that says dc-fix on the back. I think this has adhesive.
What might be hard to see in the before is the horrible squarish shape of the hotspot. It has be dc-fixed……
