I think so. Especially from the direct ray. Too risky
This one paired with a silicone TIR optic will be a nice pocket UV FL. Still can’t find any 20mm silicone TIR available.
Pictures and beamshots added
Subscribed. UV research led me to BLF, then BLF taught me how to speed spend money :cry:
I have had 2 Cometa knock-offs for some time now and have been waiting for an opportunity to have one rebuilt into a nice 365nm. Could this possibly be a respectable mating? ( I would use it mostly to locate bio stains causing hidden odors in people-dwelling-structures.)
Also, if 365nm happens to light up precious stones during night walks, that would be a true bonus.
Thank you for your review clemence!!!
These look great and I’m very intrigued, but if I understand your comment above correctly, we can expect these things to cost ~$40-48 each. That’s…a lot. Still, I’m looking forward to seeing how further testing comes on these guys.
Dont forget the Convoy S2+ with the Nichia 276 Diode for 20.99$
Runs the diode at 700mA while it is specified to 500mA, about 800mW UV to be expected
Djozz got a custom board for those Nichia LEDs that provide more heatsinking
Another interesting diode in combination with ZWB2 filter that has a DTP electrical isolated footprint is the Lite On LTPL-C034UVH365
Costs only about 7.5$
http://www.digikey.de/product-detail/de/lite-on-inc/LTPL-C034UVH365/160-2184CT-ND/5414544
http://optoelectronics.liteon.com/upload/media/media/New%20Products/Datasheete/LTPL-C034UVHXXX%20UV%203535%20Lens%20type%20Series_Ver3.4_20150723.pdf
This one has a rated radiation flux of 900mW at 700mA on DTP star probably 1.5W no problem
There are also other LEDs that might be interesting
http://www.luminus.com/products/Luminus_SST-10UV_Datasheet.pdf
Yup, USD 40 will be the minimum retail price. I don’t think I can supply BLF this one, too damn expensive.
I saw Lumitronix sell similar stuff, but can’t get the exact bin.
The main interests of this NVSU233-D1 are the narrow emission angle (more OTF output for some design) and the 1400mW (@1A) potential bin. Will confirm later if it’s available to the public
The LEDs got a really small die size with 1x1mm, so in reflector lights they perform well.
The narrow lens is nice for zoom lights but they need a glas lens.
Basically for an UV light the spill with a nice hotspot is more useful than a zoom.
The domeless in a reflector light like a Convoy C8 would be as great like a dedomed XPE2, still having a useful spill
I’ve wanted to make a uv flashlight for a while but cannot seem to decide on an emitter. I only want to make one so I want it to be good. The emitter in the op sounds nice but it is expensive however, I am afraid I will be dissapointed with anything cheaper. Yes, I know… this is the story of our lives 
The convoy S2+ with Nichia and Djozz board is great
you get about 1W of UV which is powerful enough for most purposes
even greater with Filter
the only downside is that when the battery falls below 3.9V the LED gets dimmer continously as it has a high forward voltage
but I did not find any 18650 driver that boosts to 4V
The thing is any UV emitter from a good brand with filter is great
as the visible wastelight gets absorbed
most affordable Emitters get to 1-1.5W with a little more current over the manufactors rating
here you can find a full test of 13 UV lights with different emiters
specs and price
Noname 41x 5mm UV LED ~8$
Ultrafire WF-502 B 395-410nm ~8$
Convoy S2+ Nichia NVSU233A 365nm ~80€
Convoy S2+ mit intl-outdoor UV LED 365nm ~25€
Ultrafire C3 UV (AA) 365nm ~11$
Convoy S2+ mit Seoul UV 520mW* 365nm / ~50$
Solarforce L2M UV Dropin 380-450nm / ~20€
BLF Romisen 365nm + 400nm ~13$
Ultrafire WF-501B 365nm ~20€
Jaxman E3 (AA)* 365nm ~25$
Jaxman U1* 365nm ~25$
Convoy S2+ Nichia (vermutl. NCSU276A) 365nm ~25$
Convoy BD04 3W UV Zoomlampe 365nm ~35$
peak wavelenghs
whitewall shots
you can see the Convoy Lights are the most powerful in this test
Drivers @ Sandwich Shoppe, been here forever, expensive but very good for UV LED and one Li-Ion
Great tests! But unfortunately no NVSU233-D1 365 (60 degree type) tested.
I’m wondering why Nichia never launch any white LED with such narrow primary optics? Cheaper for lights manufacturer because they could possibly eliminate complicated optic systems and boost output in certain applications such a desklamp for example.
Osram has the SSL-80 with the narrow angle, it has a small XP-E size die. The Oslon Square, with larger XP-G size die does not come in a narrow angle dome. So I think that the narrow emission angle domes do not work well with larger dies and are therefore necessarily limited in output. Perhaps that is why Nichia does not see the merit of such a led.
I thought so too. Narrow primary optics efficiency could be in between domed and domeless.
I am ignorant of the applications. Is this the prophecy for 2017 uV sterilization revolution that led magazine gave? Or is this a black light? Just curious, since it would take years to convince me uV kills germs fast enough to replace chemicals. Though I am interested in the claims. Does it work through glass, how long, how many watts, etc. .
Or are blacklights and uV germ killers the same?
Watched enough cri, had enough Halloween, and watched enough 20/20 to know to never take a blacklights into a hotel room where you are staying.
nichia getting interesting as always.
great thanks clemence for everything you do.
From what I know/read, UV does kill bacterias but, different bacterias killed with different UV spectrums. 365nm is way too far offfrom what usually used for sterilization (255nm - 280nm). Lower wavelenght certainly increase the risk to eye injury.
As in many UV sterilization, clarity is the key. Each passing through any medium will weakens the electromagnetic energy, thus reducing it’s power over distance. For example: those UV pass filter claimed to block any visible lights (while still passing UV) reduced the total amount of UV passed. This is also how UV block eye protection goggle works.
In my UV photo sessions, I used electric arc welder goggle. All UV rays looked yellow behind this glass, yet I still experienced tingling pain when accidentally looked too close
- Clemence
Yes, the sterilasation revolution is about 270nm leds, they have become way more powerful and cheaper over the last year(s). We still talk about only a few milliwatts (compared to 1000mW for a modern 365nm led), but it is enough to be used in affordable and portable low power water sterilisation devices.
I read about those sub 280nm LEDs they are not so common and powerful yet.
But compared to 365nm the sterelisation effectivness is about hundret times stronger and it kills everything.