Closed: Group Buy for 20mm x 2mm ZWB2 UV Pass Filter

Why did I thought that UV filter is for white led, to let through UV light and block everything else!!!

I’m interested as well depending on price. Wouldn’t this thread be a better fit for the User Negotiated Deals section?

If the filter is sold as ZWB2, I would think another test should not be neccessary. For other types of filters a transmission spectrum will tell the tale.

Interested

Well, it would work that way for a white LED. :wink:

But it is intended for a UV emitter.

But why you need UV filter for UV led?
Except if UV led is not that good and provides wide range of wave band than what is considered “true” UV :Sp

Egg-zactly! We need to filter out that annoying visible light! I’ve wanted to do this for ages, but the only option, other than an expensive custom-fit filter was found on a page suggesting that I buy and break open an incandescent blacklight bulb and tape the broken glass over the light. :Sp

It appears inherent of 365nm led design that apart from the peak around 365nm there is a low intensity broad band of visible light (400nm leds do not have that, and I am testing an LG 385nm led at the moment and it also does not seem to have the problem). Only Nichia found a way to minimise this (but it is not completely absent).

So the visible light problem is not restricted to cheap leds (the expensive Ledengin 365nm led also puts out the whitish light), and a uv-pass filter just fixes it very effectively.

Thanks for this clarifications guys :beer:

Interested, altho’ I already have a couple of these ordered.

As with a lot of things bought this way, I’m somewhat dubious that we’re getting first quality, rather thinking we may be getting cheaper seconds, but time will tell.

Interested. One or two, depending on price.

Same here.

Interested

I will take 3 if this goes ahead. Suitable packaging should be part of the deal, a simple ziplock bag wil not cut it.

Just received the Jaxman U1 today… The filter makes a huge difference compared to a bare MTN or Convoy S2 UV emitter.

I might be in as well depending on the price.

ZWB2 is 365nm-pass right?

I know there are also ZWB1 and ZWB3 but don’t remember which wavelength they are for.

I would be interested in 2 or 3

Found this graph for reference:

I’m in as well. Will they be offered in more than one diameter?

Bump?

On aliexpress they can be found in various diameters, and can probably be made in any diameter as long as you buy enough of them. I think that for a group buy only 20mm and 18mm could raise enough interest, perhaps 12mm (there will probably not be hoards of people who want their 365nm led in a C8 )