Nichia NCSU276A U365, a rough test (april 25th 2016, test updated)

If you follow the CPF-link, mash-m made some banknote shots that show the difference quite well: the Ledengin LZ1 gives off a dim white-ish light apart from the UV, this Nichia almost nothing.

I'm looking forward to uv-test the amber :-)

Interesting stuff. Thanks djozz.

Again nice work. Thanks heaps.

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And Nichia UV is best choice if someone want to find UV light.

I want to make triple Nichia UVs if there is compatible triple 20mm mcpcb.

Is there any mcpcb for Nichia UV? Nichia UV’s footprint was changed to two side not three pointed footprint like Cree LEDs.
That is not good for me.

djozz
I’m looking forward to your results. The Nichia is too pricey for me with the shipping from Germany so my next UV light will be another LZ1 but inside a TrustFire Z6 this time since your LZ1 zoomie inspired me. I got some glass lenses coming to try out since UV and plastic lenses don’t work as well.

You also inspired me with your MCPCB mods so I will be modding a Maxtoch XML 26mm MCPCB for a LZ1. But before I can do that, I have to figure out how to remove the frackin’ driver. :~

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You know that you can’t use a triple optic right? (not with UV)

Oops! I didn’t know about it.

Would you tell me why triple lens can be accept UV LEDs?

Thanks
Kim.

UV is 10nm to 400nm light. The triple lenses are made of polycarbonate (PC). If you look at polycarbonate light transmission graphs you’ll see that PC blocks <400nm light.

That is why. The UV will not go through the polycarbonate lens. You must use glass or other materials.

Thank you for your advice. It is very helpful!

I’d better to make UV LED only single die with reflector not triple.

=much cheaper too :-) !

I can confirm the graph in practice: plastic lenses almost completely blocks 365nm light and glass transmits almost all of it. I had to buy a glass lens for my Ledengin LZ1 365nm zoomie for it to work.

Very cool. Thank you for sharing. djozz, your work is excellent, as usual.

Illuminiation shots please. Just skip any bathroom illumination pics. :Sp

http://www.gearbest.com/led-flashlights/pp_277704.html Convoy S2+ Nichia UV 365

^
I just received the above light. Its the best UV LED I’ve come across, but it puts out much more white light than I expected. Even after adding one of those zsomething filters. Asked my wife if she also saw a bright whitish hot spot. She said she did too. Her eyes are 11 years younger than mine. Seems unlikely we both could see into the upper UV spectrum. Even with UV googles, the hot spot is pretty bright.

Doesn’t seem better than the cheaper 365 emitters I have purchased other than the output level. Unfortunately, I don’t have any other UV lights to compare to at the moment as my wife lent them to one of her co-workers. I do have a couple different emitters that I can use to build new lights with.

The emitter looks similar to the pictures above, but I haven’t closely compared it yet.

In the Convoy from GB nichia is not god soldering

http://forum.fonarevka.ru/showpost.php?p=839893&postcount=642

If you look at this post, you can compare how your led looks like. If the white stuff between the die-lines has disappeared, much more white light is emitted. I’m pretty sure that it is caused by the led overheating at some point, in my case the ledboard was floating because I did not tighten the pill well enough, or the solder job could have been bad, like Serp showed.

??? It looks like what little paste was there never even fully reflowed.

Thanks Serp, djozz, and RMM. Mystery seems solved.

Well, it’s still the best UV light I have. Time to beef up the thermal path with something like this.

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Yep.
It was removed by hand from the base star.