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 
Cheers David
HI David, which one did you buy? link us
Sorry, I bought it in January, all gone now, however the seller has a couple of other 365nm led’s mounted on cree type stars.
As usual its pot luck, link to the ebay.au store,
Should open with results for ultra violet displayed :party:
Cheers David
Now this looks like a scam. Right up there with the cheap SkyRay Kings on Ebay.
https://groupgets.com/campaigns/118-nvsu233a-u365-high-power-uv-led
At least their claim about unavailability through the 'regular distributors' is not true, I can buy it at leds.de for 54 euro's (~$60). I would indeed not trust the $15.50, but it is tempting....
I know a couple people with the last name Law. It’s not as common as Ho or Chan, but it seems pretty common here
You don’t want to know 
” NVSU333A, the world’s first standard, high power UV365nm, NICHIA Nichia factory direct supply “:http://translate.google.com/translate?hl=en&sl=zh-CN&u=http://detail.1688.com/offer/45343824860.html&prev=search
UV group buy starting
I have MTE-301 & Nitecore CU6, they are the best available. Nitecore marginally less visible blue spill. I’m having a torch built for me using NVSU333A which should be interesting, will post a review when done on my UV page.
Btw if you want to test the purity a UV torch, don’t use paper (it is dyed to fluoresce), shine it on a spoon, that’ll show you the visible blue spill. The spoon should be black (no reflected visible light at all). If it’s blue you have visible blue being reflected from the torch.
-Johan
You don’t want to know
” NVSU333A, the world’s first standard, high power UV365nm, NICHIA Nichia factory direct supply “:http://translate.google.com/translate?hl=en&sl=zh-CN&u=http://detail.1688.com/offer/45343824860.html&prev=search
[/quote]
Wow, like 158 USD each lol. If you order 5 or more it’s 153! XD
Wow, like 158 USD each lol. If you order 5 or more it’s 153! XD
[/quote]
So $5 off if you order 5 or more, you say?
New group buy! NVSU333A, we need 150+ people to get them at $3/unit, and they’ll throw in a custom copper DTP star!
I realize this is a bit of an old thread, but I had a customer send me a NVSU333A U365 to be installed in one of my copper p60 modules. IIRC it fits the xhp70 sinkpad fine (this was a while back). Just like a cree you can over drive them. I think I ran it with a mostfet driver at like 6-8 amps. This particular customer had a high risk tolerance ($150ish LED). The emitter held up. This is also how I discovered that older Surefire 6P bezels came with a polycarb lens and not a glass one. I stuck it in my 6p and ran it a few seconds to find out if it was working and this was the result.
Aside from that hiccup everything went perfectly. Despite the “safe” UVA wavelength I’m gonna have to say watch your eyes/skin boys.
Thanks for the report, that 333A seems awesome, time for a lowered price for them, like Nichia did for the 276A.
UVA is very nasty for your retina btw, polycarb glasses obliged!!
What is your opinion on the basic low power 395nm UV LED flashlights commonly being sold? I typical opt for wearing glasses when using any UV stuff, but it seems to be a common belief on the internet that its basically “safe”? I’ve not been able to find much solid data.
The 395nm flashlights are not safe. Our eyes are just very slightly sensitive to 395nm, so if we see a faint purple glow, our eyes already receive lots and lots of light, and our pupils do not contract in response of that like they do with white light.
The danger gets greater when the intensity increases and when the wavelengths gets shorter: our eyes respond properly on green light; our pupils contract and we look away when there’s lots of it, a flashlight with a blue XP-E2 at 1.5A will already be harmful if used for a while; our retina’s receive quite a lot of radiation without much noticing it, a properly driven 395nm flashlight can do proper damage when used for a while without eye protection (yellow glasses), a 365nm flashlight can damage your eyes in a short period of time.
Personally I notice when my eyes receive much UV, my retina’s start hurting. Probably then already some damage is already done but I get the impression that it fully recovers. I will not test what happens if I at that point continue without protective glasses.
I’m with you. I had never thought about the pupils not contacting to the wavelength of light. I have had that experience of my eyes hurting. I was pointing a uv light away from me in an open area ( I didn’t own the correct glasses back then). Within a few seconds I could feel a difference in my eyes. Working on the lights I always thought it a good plan because of the risk of getting a direct hit from the beam, but you bring up a good point for any use. Thanks again.
Am I correct in assuming that the ratings on these are two different things? The cheap one being 3 watt as in its rated power consumption. The nichia 540mw meaning some form of output of the beam similar to a lumen rating? If so is there a way to estimate the output of the cheap one?
Can standard glass be used across all wavelengths of UV. Example polycarb is ok for 395, but will block 365mn. Is glass ok for those, and for wavelengths below like 280 etc?