Thank you very much for the testing and writeup.
You write in such great detail and clarity about the considerations you make underway during your testing that it is always i pleasure for me to read these tests.
Thanks to you all for the nice comments again.
I have way more time to think of what I am going to do for the hobby and how and why, than I have actual hands-on time for testing and modding, I think that you can find that back in the write-up as lots of thoughts and considerations about what I did.
Without people like you and many others here none of us would have a grasp of this hobby.
so which centered gasket fit this led?
xpg or xml?
want to make a 16340 UVight 
The xp centering disc will work. It didn’t look right in a p60 so I didn’t use one. I just set the reflector over the led.
Just ordered a pair of these. Also ordered 2 of the same looking ones from an ebay seller to see if they’re the same.
Thanks for the testing and putting this all together.
CK, which ebay led? Can you give a link?
These have been popping up ebay for around $5 shipped - says 365nm as well. Anyone has tried these?
That looks like one mangled xb-d… like they pulled the dome off and scraped the phosphor ir…
I almost got those to but decided against them.
I got ebay item number 321464744098
So is it really 365 wave length as it said?
I would love to see how the KD P60 drop-in (with two cells) compares against the two emitters in the OP. The KD drop-in (two emitters under one dome) already works significantly better than anything else I’ve tried, and if the two in the OP work even better still, that’s pretty exciting.
Those UF-602C hosts are great for small mods and I’d love to use one for UV instead of the relatively huge SF-L2m I’m using now.
Excellent. Thanks Djozz.
FT has dual XP-E stars
Would this type of emitter be able to sanitize the air (kill microbes and whatnot)?
UV-leds have neither the power nor the wavelength to be the least effective in killing germs. UV-cfl tubes and other UV-sources have way more power and go much deeper into the UV-spectrum. Leds become only interesting if a directed beam is needed, cfl tubes can not do that.
Picked one of these up. You think ~1350mv is good
My in-law was saying that it shouldn’t shift with higher power
No, the Ledengin shows a shift of a whopping 0.3 nm when going from 400mA to 1000mA, I'm not sure if anyone is concerned by that ;-) .actually, temperature has a considerable larger effect: 3nm going from 20 to 85degC.
This chinese led surely will have other characteristics, but I would be surprised if the current->wavelength shift will be disastrous.
But apart from this, why run it at 1350mA ? Stick to 1 amp and you are almost at maximum power, you just make heat with the last 350mA (and stress the led unneccessarily).
I’m like dbc… I’ll try it at a amp then thanks djozz
If you refer to the KD drop-in that DCBstm posted here above somewhere, with the two die's side-by-side, this led will perform better already if only because it is a single die that will have a better beam, even in a small reflector. But I would think that the output is also better because it is a more modern led: the datasheet is from 2012, the two-die led from KD has been around for much longer.
The 16340 host is not the UF-602C host, but it is noticably smaller, and of better quality. It is this flaslight, unfortunately sold out at Fasttech. The 2x7135 NANJG driver came with the stock light :-)
Kaidomain P-60 drop-in
LED ENGIN LZ-1
Images taken with Canon 20D, in RAW, Manual mode, on a tripod, 1 second f/4.5 at ISO100. 10’ from bookshelf to camera sensor. No sharpening or any other adjustments applied, RAW converted to JPEG for sharing.
Base image with Auto settings and shot in JPEG
The Kaidomain drop-in is less bright with mutliple cells, the driver cuts the amperage the higher the voltage is to maintain a constant output current. I’ve tried it with as many as 6 cells (hope I’m remembering that right, I used 18500’s with multiple extension tubes on an L2P) directly comparing output from 1-6, 1 being the brightest in overall output.
Convoy has introduced an 18350/16340 version of the S2 that will be available pretty soon. Richard has some coming in. 