Ultraviolet Emitters

“265 nm uv led”

You might need to reflow it.

lol 265nm is in germicidal range, something you do not want to look at or even be exposed to. it is uvc, it may give you cancer quite fast, and leave you blind.

not to mention they are pretty expensive, some run up to $6000 for 1 pc.

Nichia has 365nm LEDs that don’t emit any white light but they are expensive.
Most paper glows blue because they add a fluorescent dye to make it look brighter white. A similar dye is found in most laundry detergents, labelled as a “whitening agent”. That’s why there are laundry detergents “for dark colors”, they just lack any fluorescent dyes. wikipedia.org/wiki/Optical_brightener

I too am also looking for a UV capable light. Preferably requiring no immediate modification, so capable from stock.

I happen across the “RoMiSen RC-3114” whilst looking through TinyWind’s EDC selection.
http://www.tinywind.com/romisen-3114-cree-mode-lumens-18650-flashlight-silver-p-14864.html

Currently out-of-stock, but available on eBay and AliExpress:
http://www.aliexpress.com/item/Multifunctional-RoMiSen-RC-3114-CREE-Q5-LED-UV-LED-2-Mode-300-Lumens-3-7V-4/32246435492.html?spm=2114.32010308.4.2.MgXGFa

Looks like a nice 18650 stainless steel tube-style light. Two emitters in a split reflector. Therefore probably neither give such a great beam profile, but useable and useful if it works.

Cannot tell which emitter is which from the description, but it looks like one is XM-L2 (silver surround and dot in corner) - likely the normal white emitter. Whilst the other would be the UV/Purple emitter.

Does anyone have any other information about this light, particularly the UV emitter and whether it might actually function as expected for a UV light?

Many thanks and keep shining,
Hirshy

Hi Mr Nobody,

Nice beamshots! Anyway, there are UV emitters that emit within the UV spectrum (plus a fair bit of blue/violet spectrum visible light. Then, there are also wavelength specific UV emitters that have a peak emission at a particular wavelength. As far as the latter category is concerned, Nichia UV emitters are amongst the best. Most of these emit minimal visible light, as has been mentioned.

Here are a couple of Nichia UV emitters that have been used in flashlights. Not cheap nor easy to source. You will need to reflow.
NCSU033B 365nm
NVSU233A 365nm

Why the big deal with these emitters?
Found this video on YouTube by hugo2x reviewing a nailbender P60 drop-in using the NCSU033B…

:exmark: Please use eye protection at all times when using UV emitters!!!

[EDIT - Added credits for video]

who here wants to hook me up with a NVSU233A 365nm flowed onto a noctigon 16mm ?
i want the lower uv cause i like to live dangerously haha

A triple with all three ranges, you could find every scorpion in range…

Well, 365nm is about the lowest you can go with the NVSU233A - other flavors include 385, 395 & 405nm.

And, if you’re going to get someone to reflow for you, why not just buy one of mash.m’s P60?
He’s sold a small number of P60s using the NVSU233A previously.

Living dangerously? To me, that would be the NVSU333A (3.6+W) 365nm. Definitely a skin cancer hazard. And if that doesn’t get you, the heart attack from the price tag probably will. These are after all designed to be run in water-cooled arrays. :open_mouth:

To be fair, the Nichia UV emitters were designed primarily for industrial purposes ,e.g lithography, ink and resin setting, etc. Don’t think their engineers envisioned flashaholics cramming these into flashlights. :slight_smile: Which is why they cost so much and why they are so difficult to procure.

NVSU333A is a weapon!

Yup, 365nm + 385nm + 405nm NVSU233A sounds like a nice combination for a triple.
Though, offhand, few issues I can imagine :-

  1. The price of the 3 emitters alone would be ridiculous
  2. Sourcing the emitters - 365nm is available from a tiny number of vendors, but the other wavelengths are not that easy for the end-user to get hold of
  3. The emitters have different Vf about 0.3V typical between the two extremes.
    The release of magic smoke from said emitters is detrimental - see points 1) and 2)

i reflowed 3x3535 365nm on noctigon triple, i paid $20 for 4.
i installed them into this light, originaly it was rguv tripple, but after green started flickering, i repleaced g,r,uv tripple with all 3 uv triple. 700ma each.
but you can not use plycabonate tir sich as carclo, you need only pmma tripple from ledil, and window must be pmma too, polycabonate does not let uv below 400nm thru.

Anybody has tested these ultra-cheap ones yet: http://www.ebay.de/itm/251553516667 ?

I don’t have any purpose for a UV light, so I won’t spend 20$ only for the LED - Will this work or are the nm too high?

Do UV LEDs still have the problem that they age really quickly? I have something in mind, that the light output is only 50% after 1000 hours.

i bought 5 of these, they are ok, they make white paper, price stickers glow. as for lifetime, i did not run any of uv light i build for even 1\10 of that, can not confirm or deny it.

From post 210 onwards there is discussion brewing about a possibility for UV-capable Group-buy of RoMiSen RC-3114 dual-led stainless-steel flashlight.

Does anyone in this thread have any interest or further opinions?

Hirsh

I bought one of these on a SinkPad because the price was right. I haven’t gotten around to playing with it yet.

3W 3535 Ultra Violet UV 365nm UV LED

I’ll let someone else beta test this since it is $45. I think it will mount on a XHP70/MKR SinkPad. Who wants to be our Mikey?

Nichia NCSU033B P33d22 UV 365nm LED 540mW Ultra Violet

http://www.nichia.co.jp/specification/products/led/NCSU033B-E.pdf

Picture snagged from Ebay.

can you link us to the nichia mounted on the Sinkpad II From eBay… the one pictured….

It’s LCK LED but it is only on the German Ebay. It’s not on the USA Ebay.

http://www.ebay.de/itm/Nichia-NCSU033B-P33d22-UV-Ultra-Violet-365nm-LED-540mW-3W-20mm-Sinkpad-Copper-/221718555640

EDIT:
Also I have noticed that LCK LED and LEDDNA both have the name Law in their PayPal name and both are from Hong Kong. I wonder if Law is a common name in Hong Kong.

Let’s compare the XHP70 and Nichia NCSU033B P33d22 footprints.

XHP70

.

Nichia

It is interesting that it has a footprint that fits one of the Sinkpads, and I'm curious if the output peaks higher and at a higher current like that. Looking forward to your build with it !

It is not the latest generation though, the NVSU333A U365 (mentioned above as well) has the same footprint but has an output that is more than 6 times higher (3640mW at 3.5A). I would like to see that happen on a Sinkpad as well :-) I think I do not want to know the retail price :-(

I got an Ebay cheap 365nm emitter and when put in a host was disappointed that it had a white light spot in the middle of the beam, so with a uv filter on my camera I took a photo of it while it was on, high f stop, high speed, and noticed that the white plastic centering ring was the only thing I could see, so I took it out, and the white spot disappeared :bigsmile:

Usual disclaimer, worked for me, not guaranteed to work for you :stuck_out_tongue:

Cheers David