ALL GONE...Free High Power UV LEDs.

MNLegoBoy · 2019-08-20T20:14:47.000Z

DavidEF:

MNLegoBoy:

I’ll take some for maybe a first mod
or some very jenky uv rock display

vob indicated above that these are far too powerful to be used as a display. They would be dangerous to your eyes. :cowboy_hat_face:

Protective glass over the front of the LED’s, but yeah that’s why it would be jenky

Lumencraft-Matt · 2019-08-20T20:27:46.000Z

Everyone who sent an address has emitters on the way. I still have some more ( there were lots $$:money_mouth_face: so if anyone else wants some message me your address.

mattlward · 2019-08-20T20:36:32.000Z

These will make a great illuminator for my full spectrum camera. Will need to get a filter for 395 now.

Lumencraft-Matt · 2019-08-20T21:24:59.000Z

Ive got enough left for about two more packages worth

moderator007 · 2019-08-20T22:10:37.000Z

I’ll try a few if you still have some left. PM inbound.

Lumencraft-Matt · 2019-08-20T22:43:13.000Z

One more pack left

nydude · 2019-08-20T22:47:55.000Z

would love to find out how these ultimately get used.

Pwsmith · 2019-08-20T23:36:42.000Z

I’ll take one if it’s still available, was planning on scooping up a driver from you too, maybe toss one in if i give you the order number?

Bill_tong · 2019-08-21T00:21:42.000Z

I’ll take one if it’s still available. Thanks

DavidEF · 2019-08-21T01:17:09.000Z

Also, what is the Vf of these?

Mr.Scott · 2019-08-21T01:55:54.000Z

I’d take 2 (or 1) if some are still available.

Thanks!

Lumencraft-Matt · 2019-08-21T02:44:01.000Z

I will finish sorting this in the morning. As of this post they are all gone.

moderator007 · 2019-08-21T03:25:01.000Z

Thanks for the generous offer VOB. Free is about as generous as it gets .

Lumencraft-Matt · 2019-08-21T17:49:06.000Z

The last of the emitters was sent out, I do apologize to the last couple of you. Everyone who sent me there info did get a package though….

DavidEF:

Also, what is the Vf of these?

They are a 3v LED and will be driven to the 2000ma range at like 3.2-3.4 IIRC. You will definitely need to regulate current with a nanjg or something. 2000ma for most small lights, up to 2500ma with a perfect thermal path and good heat sinking.

Don’t let these things fool you either. With Cree LEDs as long as you are still gaining output by adding current your basically safe if your heat sinking is able to dissipate the heat. With these that is not the case. You can drive them to 4000ma and still see positive gains, have perfect cooling, but the emitters WILL FAIL prematurely doing this. Could be within moments or in a month but it will happen. When it does the LEDs boil and turn black, some will even explode LOL… QC on these is “interesting” I’ve had strings of them before that even had the + mark on the top side be incorrectly placed… All of the ones I sent for this thread did have the + mark correct though

Reminder: These are not a toy. If you power them on without proper colored glasses you will damage your eyes. Immediate eye strain will be apparent. Even if your working with them in the day light you need protection……

Look forward to seeing what you all create!!!

snakebite · 2019-08-25T02:00:04.000Z

i wound up with a supposedly defective 395nm ink curing uv light from a printing press.
its a big water cooled array of multi die modules.
i am going to see about making a flashlight with just one module.
the scorpions will glow then go up in smoke!
i suspect your project these leds came from would do much the same.

Cereal_killer · 2019-08-25T05:44:51.000Z

Matt sent me the couple I was gonna use and several others marked “maybe”, I tested them all and they do work so if anyone would like a few who didn’t get any PM me your info and I’ll send you some of the confirmed working “maybe” ones.

Cereal_killer · 2019-08-31T08:41:45.000Z

For my first build, I threw together this M2 host with 7x7135 driver (HQ10D).

Need to update the A6 based FW tomorrow to be 1 / 2 modes as the only option.

djozz · 2019-08-31T10:04:30.000Z

Cool!
I received mine (Matt threw in a generous mix of UV leds in a variety of conditions ) and I’m considering some over the top build with them.

Scientist · 2020-01-04T23:37:18.000Z

I was lucky enough to snag one of the Sofirn SC31B’s when they were offered last fall and I put one of these emitters in it. You are right Matt, these are really powerful. It was easy enough to get the (glued) bezel off with a strap wrench and the new board that Matt supplied fit right in.
The cross on the emitter will make a donut hole in the beam unless you fiddle with the reflector height. By unscrewing the bezel I can get a relatively uniform beam with the OP reflector. One of these days I will try to come up with a good collar for the emitter spacing.

Some minerals fluoresce great with this, my primary interest. Most studies of fluorescence in minerals have been done at shorter wavelengths (254 and 365nm) so there isn’t much information on what this wavelength is good for (yet!).

This is some hexagonite I collected in upstate NY. You can’t use the usual ZWB2 filter at this wavelength unless you really want to cut down on intensity so I am using without filter. The blue glow you see is from the extra visible light at this longer wavelength. If this bothers you, wear some yellow filter glasses. I got some at the local auto parts store that came in a kit with a little 395nm penlight and a bottle of leak check fluid. I would strongly advise wearing filter glasses when using this emitter as all kinds of surfaces reflect the light and can cause eye damage quickly. I am finding that this longer wavelength is most effective for organic materials, so the leak detector solution really is bright. Things like paraffin and gasoline fluoresce well also. I hope to try this outside once the snow melts.
Matt is concerned that this emitter might not take too much current. On my tail cap measurements I got a value of 1.5A on high but this was done using a DMM (Sofirn supplied battery). Others using a clamp meter said they got more like 3A. I have not seen any ill effect of this high current with this apparently sturdy emitter. What about heat? The graph below shows the temperature of my light on high. It appears that the driver has a timed step down starting at about 3 minutes and this keeps the head of the light below 40C. I superimposed measurements derived from the video Funtastic posted in a thread about this light to show when the stepdown occurs. I tried measuring the intensity changes of my light with my tablet. I do see a stepdown occurring at the same time but I don’t think my method was recording the change of intensity accurately. So this seems like a great light to use for this high powered emitter. Even without Sofirn offering a big discount it is a very affordable light. Thanks again for your generosity in distributing these vestureofblood.

contactcr · 2020-01-06T22:53:12.000Z

I think if you reamed out the reflector to a fairly common diameter you could find plenty of 5050 centering rings to try. Some people use drill bits, hand drill reamers, or even a blade from scissors to do it. YMMV