Cheap bare 385nm UV LED

Dam Jos i did not see your 385nm SKR mod. Nice output!
To bad that a Quad reflector will not fit the Wall-E light. But with 3W+ real 385nm light output it should be good for curing the UV plastic i ordered from ZHANLIDA Online Store. I use some of their glues for month and now i wanted to test the UV plastics they have. Two of the three are on the way.

Update.
Yesterday i asked the seller for a better price because we take 40 leds without the PCB so he do not have to solder them on the boards and can keep the alu boards. A few days ago we arranged a small discount if i take 2 lots /20leds. But the final price i got this morning was more than the price for 2x 2 lots - the discount. It was 1€ less than the normal price with the alu boards. So i want to wait what he has to say to this.
The content of what i finaly asked him is, if its normal that the price/pcs goes up if i order more + saving him time and money (no soldering needed and 40 boards he can keep).

So now we agreed on a new price and i hope that we can get the payment done today. Its not the price i wanted but its better than before.
When the money it send and i got the ordering confirmation i will give you the final price.

Thanks!

So the final price is 1€/Led + 1,50€ shipping.
I had hopes that we could get below the 1€ but he was not willing to go further. But we get bare unburned Leds. And thats a good thing after reading djozz test (the led was soldered to hot and that could damage the led. Especially if you have to reflow the led a second time to get it on a DTP board).

I try to imagine a lightbar with all 40 of this UV Leds on copper DTP boards, pushed to 1500mW real output power.
The lightbar would come with at least one of this stickers :smiling_imp:
,

Will you be sharing payment information soon? Or, wait until you have the LEDs in hand?

Thanks again for doing this little GB!

It will probably take a few weeks for the leds to arrive. The faster shipping option was way to pricey. I feel better to take your money if i can give you the leds in return. But you can decide for yourself. I will send out the paypal information in the next few days.


And no thanks needed. I got my leds also cheaper. And i do not have a bunch of leds left. So eveybody winns!

Last Update. The leds are out of China and on the way to djozz.

Its one step closer.

Now it should not take to long anymore!

Ok, I got the leds in.

And there’s complications. This is how the leds look, it is not the same led that the OP is about.

  1. it is a LG led alright
  2. it has the narrow 55 degrees emission dome
  3. it is from a newer generation than the led that I tested, with, if specs are compared, almost double the output at 500mA ( LEUVA35T01TL00, 385nm Narrow, 1100mW typ. at 500mA)

The newer generation with better output (I would still have to test what the real world performance is) is pretty cool of course. But that it is the narrow emmission version may be not cool for some.

So perhaps the folks who have signed in and even payed for these leds should post how they like them, especially of course TheOnlyDoc and alpg88, who will get the bulk of the leds.

(ok, I’ll start: I had no ongoing project for these so I just love what’s going on :party: and would not mind getting 8 of these instead of the 3 that I signed in for)

I like it! The 55° emission dome is even better for me. So i am happy. And i will not complain about getting a newer generation with more output.
I send a PM to all on the list.
And i contacted the seller and asked for the flux and voltage bin. But ~1400mW at ~700mA is dam hot! My DD tripple could get really hot :smiling_imp: . I am eager to see what this led can do on a copper MCPCB at 1 amp+. If i had to guess i would say that the tripple could get easy 4-5W real 385nm output.
Maybe i should get one of this stickers for the light :smiley:

does it mean they wont work as good with tir? i’m planing to use PMMA triple from ledil, i used it before with 365nm leds. but those had 120*

It will be an surprise how they behave in a TIR. I do have a Ledil Cute and a 32mm Noctigon board I could check, but it will take another week before I actually have time to do the experiment.

I thought that plastic lenses/TIR are not the best way to go if you use UV leds. Also AR coating on glass lenses. Thats the reason why i ordered new lenses for my Wall-E light (against the description the light arrived with cheap plastic lenses) one with AR coating for the MC-E led and one without for the UV tripple.

I might have to grab some of these LEDs and throw together a P60 quad drop in, no optics, just bare emitters, would be handy for checking for leaks with fluorescent dyes and other close up stuff, which is really all I do with UV anyhow.

Is the new version available on Ali yet?

they are not, vast majority of them, but those made with PMMA are ok. unlike polycarb pmma can work with band as low as 365nm.

Dam i could have fit a quad copper mcpcb in the Wall-E light. Mhh but now i have a tripple board with small tripple reflector here. No no no it is tempting but no i will not do it. :person_facepalming:

@Jensen567
The shop on Aliexpress is selling these leds on Alustar 10pcs/lot at $12.75 (https://de.aliexpress.com/item/10pcs-3W-3535-High-Power-LED-UV-Light-Chip-365nm-385nm-395nm-405nm-420nm-Ultra-Violet/32805138361.html).
Normal price at this shop is 15$/lot.

I’m not sure that there is a PMMA Ledl optic for the quad boards used here on BLF, these quad boards are made for Carclo 10622 optics which are made of polycarbonate that has a cut-off at 400nm.

But aparently you do not know what you will get, I’m pretty sure that if you buy these leds on the 20mm star it is still the older generation led (which perfroms fine btw) with the 120 degrees dome because they still have already produced stock, and not the newer gen. with 55 degrees dome like we received as bare leds now.

What are the plastic lenses made of in the cheap Chinese zoomies? I’m thinking with the tighter 55° emission dome, an aspheric is better than a reflector. But, I can’t afford nice lights with glass lenses! :stuck_out_tongue: