tir lens and UV,

There are TIR materials that go down to 350nm

mrheosuper wrote:

tir lens and UV,

Lexel wrote:

There are TIR materials that go down to 350nm

If you want to see what some people do with UV lights look at this site Nature’s Rainbows . There is a post there on the Convoy S2+ with the Nichia emitter. Honestly I think this is the light all budget UV light should be judged against. For $20 I think you should just get the Convoy and forget the others. Thanks for the review though, you never know what you will find.

UV doesn’t pass through PMMA too well, or hardly at all.
I guess the little UV Jetbeam uses the proper material for their TIR, but unfortunately it has no filter (you know, the ‘black’ glass lens).

Do you have a link to this light?
Can’t find it on AE

Jerommel wrote:

UV doesn’t pass through PMMA too well, or hardly at all.
I guess the little UV Jetbeam uses the proper material for their TIR, but unfortunately it has no filter (you know, the ‘black’ glass lens).

mrheosuper wrote:

Jerommel wrote:

UV doesn’t pass through PMMA too well, or hardly at all.
I guess the little UV Jetbeam uses the proper material for their TIR, but unfortunately it has no filter (you know, the ‘black’ glass lens).

the jetbeam mini uv uses reflector, not tir though

I.i.r.c. Djozz has a zoomie with UV LED, i think with a plastic lens.

wle wrote:

link

https://www.aliexpress.com/item/NICRON-2W-Mini-UV-LED-Penlight-Flashlight-Purple-Light-Waterproof-IPX8-LED-USB-Rechargeable-Torch-Lantern/32799030739.html?spm=2114.search0305.4.5.PDFpQM

wle

wle wrote:

Convoy S2+ 365nm: ——> too spensive, too big…

maybe one day

wle

You have a point.
On the other hand, and not meant to offend you: a light that emits more visible light than UV light is pretty useless IMHO. Read the reviews on this site, or on the site https://www.naturesrainbows.com/ . The Convoy I got came with a ZWB2 (black) filter, but you can buy them separately. It is a world of difference. This filter blocks the visible light, so we don’t have to ask ourselfs constantly, was that fluorescence or wasn’t it.

Jerommel wrote:

mrheosuper wrote:

Jerommel wrote:

UV doesn’t pass through PMMA too well, or hardly at all.
I guess the little UV Jetbeam uses the proper material for their TIR, but unfortunately it has no filter (you know, the ‘black’ glass lens).

the jetbeam mini uv uses reflector, not tir though

O, Okay.

I.i.r.c. Djozz has a zoomie with UV LED, i think with a plastic lens.

The OP describes a led that sounds like 365nm, or close, so perhaps a PMMA TIR is used.

wle wrote:

yes, the white one apparently has high, low and blinky modes

wle

This might interest you perhaps, it’s on a discount at the moment:
https://www.aliexpress.com/item/-/32833403772.html

wle wrote:

all i know is, there is some visible light.

i can;t see the UV, so how would i know what the ratio is?

i do know the light gets warmish in a minute or so, so i assume there is a lot power going somewhere, i hope it;s to the UV, not just the visible part, or the heat itself..

wle

To get an idea of the ratio, point the light at a piece of white photocopier paper, the blue fluorescence (that is a measure of the UV that it comes from) hugely over-shines the visible light from the led itself.

wle wrote:

what is wrong with TIR and 365nm UV though?

Some cheaper plastics will turn brown and otherwise degrade with cumulative UV exposure.

wle wrote:

so – given that this thing puts out a lot of bluish light, would it make sense to get a small piece of woods glass and add it to the front to filter that out?

wle

I tested such a filter a while ago for flashlight use: http://budgetlightforum.com/node/41697

Your title says Nicore, but link says it’s Nicron.
One of them must be wrong…

I have the S2+ with Nichia LED. Pretty powerful. compared to my other UV lights (Kaidomain WF-501B with cheap UV drop-in + Convoy S2 bought few years ago).
Also, you can buy something like this for blocking visible light: https://www.banggood.com/365nm-UV-Flashlight-Visible-Filter-Lens-1pcs-p-.... Along with 18350 tube it will be pretty short light and still giving loads of UV…
Acrylic lens give a little fluorescence in UV, so may add some of the visible light as well.

Edit: sorry, didnt realize that editing can bump the post

I decided to get one of this during a promo flash sale in AliExpress.

It does emit a lot of visible white light (seems to overpower the UV light).

But if I place a ZWB2 filter (I only have a 20mm ZWB2 filter which is too big to fit inside this flashlight, so I only held the filter in front of the Nicron B10-UV), after that, the visible white light is now mostly filtered out, and what remains does look like 365nm wavelength UV (when compared to my Convoy S2+ UV365).

I’ll try to take some pics sometime for comparison..

For what it is worth, I contacted Nicron about their B-75 light. It showed up in one of the coupon offers on BLF but doesn’t look like it is showing up on their web page yet. It is a rotating head light with both white light and UV emitters. The description said 365nm in one place but 395nm in another. When I asked about this they said the 365nm was a mistake and the emitter is 395nm. I am guessing that the inexpensive twisty has 395nm too. If so it will limit the usefulness for UV.

Edit: Sorry, here it is https://nl.aliexpress.com/store/product/NICRON-Magneet-90-Graden-Twist-UV-Wit-2-Color-Oplaadbare-Zaklamp-18650-2500-mAh-Ion-Batterij/111575_32833496892.html?spm=a2g0z.12010615.0.0.4dd12017DDxiKL . They have changed the web page some since I first saw it.