new 3535-size 365nm led, chip by Semileds (led provided by led4power), a test

I wonder about the price as well.

My girlfriend&child are on a holiday together and will come back next friday, so I'm good with the kitchen until then ;-)

I just checked the looks of the Nichia NCSU276A led that I used in the comparison pictures of the test in the OP, and it looks no good .

This was the led at the time of the test half a year ago:

..and this is how it looks now:

It looks like the white stuff virtually disappeared. I have no idea what it does, but together with the impression that the output had gone down and more visible light seems to have appeared, I'm not trusting this led anymore.

So please ignore this led in the comparison in the OP. Btw, I still see no reason to distrust the comparison of the Semileds led with the Royalighting led.

The Nichia led has not seen any significant use, and the current of 700mA is within specs (the maxiumum continuous rating), but perhaps the head of the flashlight was not tightened enough to let the reflector press the board down and the little square aluminium ledboard has been floating in air? I don't know.

Wow, that nichia.

Added FS thread here:

Hey djozz, would you mind sharing a source for the uv filter lens?

Djozz and I got ours here , but the price is too damn high.

There is no reason that a small piece of Wood’s glass should cost that much. If it was that expensive, the black light bulbs that I own must be priceless.

I got GB and BG looking for a cheap source. They said they could do it cheaper. If Jaxman can sell a complete UV light with filter for $25, you know that $16.66 lens is too damn high.

I like that there are 10mm lenses out there, I might have to get a 10mm XP Sinkpad mounted UV and a Hugsby XP-2, then make a UV pen light.

As for the fried Nichia, they are getting cheaper to replace.
http://www.aliexpress.com/item/NCSU276A-Lamp-led-violet-borgia-365nm-neon-led-flashlight/32400010782.html

$8.00 × MOQ of 4 = $32

We can get a Jaxman U1 FOR $20 in djozz’s group buy and soon get a Convoy S2+ with a Nichia inside for $22.11shipped and the Convoy BD04 with a Nichia inside for $29.26 shipped.

It gets cheaper and cheaper to have your eyes hurt!! :party:

(and the eyes of the occasional scorpion..)

And the eyes of the occasional single mother or girl working their way through college too? You need to test that out before the before your girlfriend returns from vacation. :bigsmile:

I just removed some rather expensive looking coated filters from a DLP television. The TV was the type that employs a xenon arc light source that channels light through a prism to split the wave lengths into red, blue, green. Mirrors then re-aim each color stage and pass them through their own dedicated filter before being projected. I assume the filters are there to remove UV from the arc light. Unfortunately, the housing that held all the optics, prism, filters, etc., was plastic welded together inside a very sturdy housing and required some brute force and cutting to open, and one of the filters got broken in the process. They all fell out in a mess, so Im not sure which 2 remaining filters were intended for which color (unless they are all the same). They are rectangular so not the correct shape, but they cost nothing. Thanks to djozz, I have a Jaxman UV flashlight on order and will post my filter test results if they are worthy of mention.

BTW, if anyone wants a large mess of interesting optics and electronics for free, just post an add online that you’ll come and collect someones broken DLP for free. I retrieved some very high quality, silent high velocity ducted 12VDC cooling fans, other silent 12VDC fans, heat sinks, rectifiers, capacitors, etc., a huge Fresnel lens that can focus the sun to ignite a chunk of wood in less than a second, several high quality tinned wires in many sizes, along with a mess of plastic and metal I placed in my recycling bin to be reclaimed. Just be sure to avoid being electrocuted by large capacitors or the traces that lead to them. IF YOU ARENT SURE ABOUT HOW TO AVOID BEING ELECTROCUTED, DONT DO IT! All in all, a lot of fun to open up and rummage through, and there’s probably something in there to amuse everyone. Its like going to Disneyland for a flashaholic! :smiley:

I just copied the above to its own thread to see if others have found other uses for DPL parts.

Thank you for a very interesting read Djoss and I’m looking forward to any future reviews! UV is what originally brought me to BLF. It was a good day! Oh, and I hope your testing station is coming along nicely :slight_smile:

Your review has inspired me to start looking for a builder and purchase a completed light using the Semileds SMD 3535. But before I do that I will kindly ask for an opinion(s).

Are there any thoughts on a UV build with adjustable focus? Would it influence the performance of UV light similar to white light in a positive way?

In my very limited UV experience it seems that it is a nice addition to have. I have a Convoy 365nm from Simon and am very pleased with its overall performance, especially with my aging eyes. The flood has plenty of UV illumination for small to medium sized areas, while the focused beam is a big help to me in larger areas.

Since having no knowledge of the UV world, I would venture a guess that cost may have something to do with it? At least I hope it is a cost issue and it doesn’t degrade the performance.

Thanks again

I thought my UV itch had been scratched, but now I want to make something with this LED and filter.

Me too, I am thinking triple Convoy S2+ }:slight_smile:

I am also planning a triple S2.

mind that 365nm light is absorbed by plastic optics, a triple will have to be a mule, or you could source a triple reflector?.

I’m not aware of any triple reflectors with an overall diameter of 20mm (eg the Carclo triple size), but three 9mm reflectors should work if those could be sourced… I think that the easiest and least expensive option (for those without a lathe) is to take three reflectors from “348” style lights and sand them until everything fits. Those 348 reflectors are probably somewhere in the 10-11mm range to start out with. :-/

Someone just asked about + and -

Now I don’t see the post.

But here is the answer.

http://semileds.com/Datasheets_SemiLEDs.htm

Here my results in pics with this awesome combo !

The link does not get you to this exact led, or the exact chip that is used for the led in the OP.

Thanks for giving a great read, it is become very helpful to me for further in my life. Great idea with great job.

I am satisfied to your answer, thanks a lot.