D-c-fix diffusion film

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maukka
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D-c-fix diffusion film

Since this question often comes up, let’s start a new thread on it.

The name was changed from sand to milky some time ago, but the model number stayed the same.

The correct SKU: 346-0211

Where to purchase?
Amazon
Bauhaus (Finland)
Smaller pieces from Boaz

How to install it?
It sticks pretty well on an even glass lens surface. Best position is to place it between the lens and bezel for secure fit.

What is it good for?
Protects the lens (if inserted on the outside)
Makes a throwy light floody
Evens out an uneven tint (Cree rainbow)

Before (with a noticeable tint shift, green ring around the hotspot)

After (also a minus green filter added to reduce overall greeniness)

How much does it reduce output?
5-10%

Does it affect tint?
It evens out the tint throughout the beam so yes, the hotspot will probably be different if you used it on a light with a horrible emitter.

Does it affect CRI
No

Without d-c-fix

With d-c-fix

Edited by: maukka on 09/05/2018 - 01:44
raccoon city
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Boaz has DC-Fix for sale as well:

http://budgetlightforum.com/node/42208

ToyKeeper
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This stuff is fantastic. I’ve used it on a lot of lights, and it turns the ugliest beam into a work of art.

Niko
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Just bought 2 meters roll Smile

DavidEF
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Thanks maukka for doing the testing for us. Now, could someone make those before and after CRI test charts into a mouse-over so that the miniscule differences can be seen quickly?

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Jerommel
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Thanks for testing, Maukka.
Only 5 – 10% loss in output is better than i thought it would be.

djozz
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A test with everything you could possibly want to know about using dc-fix on your flashlight
Great test! Thumbs Up

iamlucky13
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Thanks for taking the time to do this. It’s good to have this sort of information documented.

Long term, it might be nice to have this kind of information indexed somewhere for easier access than sorting through forum threads.

Also, has anyone ever done a controlled comparison of DC-Fix vs. a matte finish tape like Scotch “Magic?” I’m curious if the DC-Fix diffuses a different amount, is more durable, sticks better, etc.

maukka
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Thanks guys. I didn’t actually do anything really, just gathered the data from some of my old scattered posts.

Agro
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What is 803?
Also, measurements don’t look like 5-10%

jon_slider
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Agro wrote:
What is 803?

http://shop.leefiltersusa.com/Swatch-Book-Designers-Edition-SWB.htm

For heat concerns, Lee makes a Zircon line that is heat resistant:
http://www.leefilters.com/lighting/zircon.html#zircon-minus-green
The 802 Zircon Minus Green reduces lumens by 25%, that would be closest to the 1/2 minus Green, that reduces by 28%

the following percent numbers are the amount of light transmitted, so 71.5% transmission means 28.5% lumen reduction..

Lee 248 Half minus green: 71.5%
Zircon 802: 75%

Zircon 803: 79.9%
Lee 249 -Quarter minus green : 81.5%

Zircon 804: 83.6%

Zircon 805: 86.6%
Lee 279 -Eighth minus green : 87.2%

Discussed here
http://budgetlightforum.com/comment/1117960#comment-1117960

Examples of with and without Lee
http://budgetlightforum.com/comment/1234356#comment-1234356

"High CRI Lights for Sale":https://budgetlightforum.com/node/75426

Agro
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Thanks for the explanation.

eas
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So, output is cut ~10% but intensity is cut ~30%.

maukka
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Those are just examples from one light. A BLF GT will probably suffer a lot more of a reduction in intensity.

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So, a floody light will lose less intensity than a thrower? Is it a logarithmic effect?

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I haven’t done the math or the measurements so this is just a guess, but it might just be a function of lens size. Bigger lens = more diffusion film = more diffusion.

maukka
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Just an educated guess. If you already have a somewhat diffused light (eg small heavy OP reflector or frosted optics), naturally adding more diffusion doesn’t have the same impact as diffusing a very narrow beam (large SMO reflector).

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ToyKeeper wrote:
I haven’t done the math or the measurements so this is just a guess, but it might just be a function of lens size. Bigger lens = more diffusion film = more diffusion.

That makes perfect sense. Thanks!

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DavidEF
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Okay, here’s a thought. It would be nice if someone would test this hypothesis. Compare a small, but throwy light (such as Convoy C8), to a larger, floodier light (such as BLF Q8), both with diffusion film. I’d love to see measured results. Wink

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Agro
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ToyKeeper wrote:
Bigger lens = more diffusion film = more diffusion.

Doesn’t sound right. It seems to me that
Bigger lens = less light hitting any spot = just like lower mode = no effect on diffusion.
Though when pattern size is large in relation to lens size that would be different.
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DavidEF wrote:
Okay, here’s a thought. It would be nice if someone would test this hypothesis. Compare a small, but throwy light (such as Convoy C8), to a larger, floodier light (such as BLF Q8), both with diffusion film. I’d love to see measured results. Wink

I made this..not the best..but u kinda get the idea.

https://m.youtube.com/watch?v=mi3hLBouZeY

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ToyKeeper
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maukka wrote:
Just an educated guess. If you already have a somewhat diffused light (eg small heavy OP reflector or frosted optics), naturally adding more diffusion doesn’t have the same impact as diffusing a very narrow beam (large SMO reflector).

That’s probably a better guess than mine.

For example, put DC-Fix on a mule. It has virtually no effect. Then put it on a thrower, and it has a much bigger effect. The more collimated the beam, the more it can be messed up by diffusion film. But making a mess out of something which is already a mess… isn’t very noticeable.

With measurements of a bunch of lights, it would be possible to generate a curve and figure out the math. But for now, I really don’t know. The effect is probably something like sqrt(candelas) or sqrt(cd/lm). Except, instead of a square root, it’s probably a different power. Like math.pow(cd, 0.95) or math.pow(cd/lm, 0.75) both get fairly close to the numbers in the OP.

Agro
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djozz
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Agro wrote:
This looks like a good answer:
https://physics.stackexchange.com/questions/102193/relationship-between-...

Not really, that question is about loss of collimation (amount of collimated light turned into scattered light), not about light loss.
Actually, my feeling is that the light loss by a diffuser of a floody and throwy beam should be the same.
maukka
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djozz wrote:
Actually, my feeling is that the light loss by a diffuser of a floody and throwy beam should be the same.

Mine too, but we were talking about intensity, not flux.

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DavidEF wrote:
Okay, here’s a thought. It would be nice if someone would test this hypothesis. Compare a small, but throwy light (such as Convoy C8), to a larger, floodier light (such as BLF Q8), both with diffusion film. I’d love to see measured results. Wink

I have a modded Convoy C8 that is essentially a Sofirn C8A . With the DC Fix it is like a C8F beam on medium.
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I also would like to see the numbers for throwers and flooders but, as ToyKeeper said, the visual effect on a flooder is negligible.

Diffusers are very nice but the drop in throw has 2 effects. First you want to increase output to increase throw again. It’s totally subjective but it’s what you want to do, so one should have more lumens available… Maybe one can get used to it after a few minutes but I didn’t try it.

Second, lots of flood are inconvenient to illuminate farther away so I don’t keep it permanently on the flashlight. I carry several pieces for different flashlights in the wallet; sticking the right one on the flashlight takes less than 1 minute. Removal is also easy and it doesn’t leave dirt on the glass. Dc-fix can be reapplied several times. I glue them back in the plastic cover that comes with it in the wallet to not lose the adhesive.

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Agro
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I wonder what’s the light loss with (multilayer) AR coated lens.
Such lens has refractive index of the material next to DC-FIX close to that of air. That would probably negatively impact efficiency…..

The_Driver
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I noticed that such diffusor foils/lenses make the outer rim of the spill brighter than the inner parts of the spill. I find this a little bit distracting. The loss in throw is also quite noticeable.

Agro
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Yeah, PFlexPro lens would be a good choice for quite a few lights. But it’s available in just a couple of sizes….

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