Hard to tell for sure, but it is a shorter wavelength than the 390 nm… and probably shorter than the 380 nm
I use these from Kaidomain, $3.03 each well protected with plastic peei-off film covering both sides of the lens. If you are careful you can place the lens without even touching the edges, drops right in to Solarforce L2 series heads.
With them in place you can hardly see that there is a lens at all and they seem to improve output but that’s only by eye, I have no measuring equipment other than my eyes. 8)
Thanks, I added it to my wishlist. FWIW, I just tried mine with four 18500's, seems brighter than with the four 16340's I had in it.
The 123 primaries that I am running with @18v are about done, but I have more, they lasted better than I thought they would, cheap WF cells.
I’ve just got 4 Samsung 18650’s that arrived within 0.01v of each other and I’ve got a spare L2T and 3 extension tubes so I think I’ll put together a 4x18650 version like yours, thanks for the tip.
Two extension tubes with a L2P body fit perfect. I'd have to look up the L2T, don't have one. I'd guess four 18500's would provide higher voltage than six CR123A's over much of a side by side run, if you're going to run the 123's to death.
Edit: L2T looks to be the same.
Seems similar to me! The MF one I’ve got emit mostly visible light, barely does anything that is UV. It’s not even that good in highlighting money security. The cheapie $1 invisible pen/UV light combo I got from FT actually does better job.
It’s closer to royal blue than anything UV.
Does absolutely nothing in highlighting biological trace, which is the primary reason I bought it. Sometimes we get rats coming in/out of the house, need to see rat’s waste so it can be cleaned.
So, despite what others have reported, my MF UV drop-in is totally useless to me. I share your sentiment, I don’t want any more UV junk, just one that works.
Was hoping to see one of the rep’s in here with a special deal for us when I got email notification, instead, spam 
I saw these optical transmission curves of glass and was wondering if anyone knew what kind of glass these lens are made of? 365nm LEDs are already very low efficiency so it’s important to pair with an appropriate lens.
Here soda lime glass has a dip around 350-400nm:
That’s no good.
Worst case for 365nm, just run it without glass, or mod a flip case. 100% transmittance when you use it.
This emitter linked below has been in my ebay Watch for quite a while. But $10 is quite pricey for something of unknown quality. Anybody had experience with one of these supposedly true 365nm?
The best results that I’ve had are from this drop in.
Since I’ve bought it I haven’t felt the need to look any further, I put an AR coated lens in front of it again from Kaidomain I’m using 6xCR123 3v cells at the moment but when they’re used up I’m going to put 4x18650’s in to power it.
It’s the best set up for me but that Tank007 TK-566 365nm 1W AA light in the OP looks hard to beat.
Same picture used on Aliexpress for a 3W 395-405nm. :~
I had a look around for some 365nm with datasheets.
LED Engin have a range of 365nm emitters, some multi-die too.
Damn. I had been avoiding any UV lights, because I couldn’t find the really good one in the OP. Now someone went and posted a link to it… so there’s a pretty good chance I’ll end up with one soon.
I am always looking for great UV lights, as I do forensic inspections, and most are crappy.
I did have a tank but they are not durable enough, and I end up having to bang it to make it go on, etc….but the beam itself was not that bad.
What I’m looking for is some way of projecting as strong a 365 nm range beam as I can, as far as I can, so I can sweep large areas at a time.
Unfortunately, I have no clue as to what the specs mean in real life, in that I find I know just enough to know I don’t know enough to be able to predict actual field performance.
IE: I try for one with higher uW/cm2 etc, but one is found to be measured at the LED, another at 6” and another at 15” and so forth.
So now I don’t even know what the top dog would output as a bench mark, etc.
Anyone have a handle on this?
Teej, I think purely from output point of view you’d be better off using a portable fluorescent UV source. The efficiency of LEDs at this wavelength really pales in comparison.
That’s true, and, I used to use them, but, I can’t carry them around and the other equipment at the same time, they’re too bulky and the tubes break too easily.
But the OUTPUT is like night and day, and if I could get even close to their output with an LED it would be a miracle - but, I just want to find the best bet for a 365 nm UV LED at this point.
Its slim pickins though.
TANK007 PT30 5W 365 nm might be what you’re seeking if $$$ is not an issue.
I’ve no idea what they’re like, as it’s outside my budget, yet may be within yours.
I believe they have a few higher priced UV torches around the same brightness.
I just received 5 bare 365nm 3w emitters from an Aliexpress vendor. I will hook one up and report back. Hopefully, tonight.
looking forward to your report Sir!
UV, its should be a glowing report.
I tried out one of these emitters that I paid $28.99USD shipped for 5 emitters. I can't tell if it's the real thing as I have no measuring equipment and have very little experience with UV lights. I drove the emitter DD with 3AAA's. Here is what I observed:
- The emitter did not put out much visible light, but what it does put out seems almost a neutral white compared to my other two UV lights that have 5mm emitters. One of the 2 is supposed to be 395nm and the other is unknown.
- It fluoresces white objects ok. Colored objects that fluoresce well with the 395nm light, don't fluoresce much with this emitter. It fluoresces urine, but not a brilliantly as with my 395nm light.
- GITD items fluoresce well.
- I got best results in mule mode. Both a reflector with a plastic lens and a TIR optic reduced output except for in the hot spot.
Edit: After using the emitter more now I'm thinking this may not be 365nm emitter. Almost everything seems to fluoresce better with my 12 emitter 395nm light. Also, the visible portion of the beam almost seems a neutral white. Kind of a creamy tan tint.