Nice work on that filter! I hope you did not breath in the glass dust to much?
What UV-led is in that Ti now?
No, and i even wore safety glasses. I bought the emitter from Ali ex ages ago, just a cheap one to try out.
I can’t seem to find the one i bought but it is one like this
I used the piece i had left over to stick on my Mecarmy SGN3. It’s borg ugly but it works.
The filter can be bought at simons shop
https://www.aliexpress.com/store/group/glass-filter/330416_507487979.html?spm=2114.8147860.0.0.xE874k
Works great with Nichia UV LED
Both pictures with same camera exposure the filter kills almost all visible light
The one at Simon’s shop is 20.5mm diameter while the ones from Gearbest are 20mm, so Simon’s version fits the S-series Convoy even a bit better.
What about 365nm LEDs ?
Does anyone have a good source (apart from LED4POWER) for a good quality UV LED ?
This led has great 365nm output but will need the ZWB2 filter because it produces quite some yellow-ish light as well.
A little late to this thread, but just in case anyone is still around….
I noticed a significant amount of reflection from the ZWB2 filter. Did some investigating into AR coatings and got back ridiculous prices. So I emailed Simon and he said the factory could do it at a very reasonable cost.
Any thoughts? My research shows that a 10% to 20% improvement in output might be expected….
I’m around 
That is a lot of improvement, so reflection on the glass surfaces from UV is worse than with white light, and so there is more to fix for the AR coating!
Nice of Simon that he is willing to do that, I’m certainly in for some of those if the price is reasonable, AR-coated ZWB2 filters should look cool too btw.
He quoted $3.83/ea which is the same price he sells two of the non-coated filters for now. He says they need to be produced (manufactured) and will get back to me. Will keep you informed
Here’s a graph showing one company’s projected improvement
That would be cool, what would be phenomenal would be to get some 12mm & 10mm sizes made too.
^
And SRK/Maglite size. I want to make a UV multi-emitter.
Also, interested in the A/R coating aspect, but different sizes more.
I’m interested in a couple at least. I have two Nichia NVSU233A-U365 1030mW chips on the way right now. My first uv emitters so I’m trying not to get too excited. 
Anyone found a source for larger than 20.5mm diameter lenses? I want to build a multi-emmiter light or even maybe a 365nm C8, because, why not 
Looked on AX, only sheets for a few hunnert bux each.
I wanted some for a ’501 or ’502, ’though yeah, a C8 would be nice!
Yes,on aliexpress there is a mix of offers with random thickness and diameter, sometimes more offers, sometimes hardly any. Usually tens of dollars for anything more than 25mm.
Pardon a dumb question. I ordered a set (2pcs) of ZWB2 filters from Simon’s Convoy store in AliExpress and it just arrived a few days ago. I’m wondering when I place the ZWB2 filter inside the Convoy S2+ UV Nichia flashlight, can I place it behind the existing plain glass lens (which is what I just did — so it has a plain glass lens in front, and the ZWB2 filter just behind it), or do I need to remove the plain glass lens altogether (ie. only the ZWB2 filter)?
When shining some other light on the ZWB2 filter, it looks like it has concentric circles/rings, though I don’t notice the concentric rings when using the Convoy UV w/ ZWB2 flashlight…
Don’t know about the circles but I always replaced the glass with the filter.
Yeah, when 2 pieces of glass get close enough that there’s a very small air-gap, you get funky optical properties. Some places would be in contact, some places would have a clear air-gap, others would be in that twilight zone in-between where it’d essentially be a vacuum (ie, other than maybe H2, no molecules would be able to fit.
So what you’re seeing is a sort of standing-wave of the 2 distinctly different interfaces: glass–glass, glass–air, and glass–vacuum, and the different refractive funkiness of each zone.
That’s why I don’t even like to keep the original glass when refitting with a TIR. Weird things can happen.
—
Oh, wait a sec… you mean just the nekkid ZWB2 filter and no other glass on/under it? Hmm, never really noticed that. Will have to look.
^ ah, now I see what rings were meant (they are called Newton rings, an interference effect between layers close to each other, close to parallel but not exact.)