Cheap bare 385nm UV LED

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:

Polycarbonate, and having measured a few for 365nm transparancy I can confirm that they block it. The small On The Road zoomie (i3) has a glass lens though, that could be a nice host for this led.

figures… :weary:

Are there any left? How much is UK shipping?

TheOnlyDoc will know soon how many are left. The shipping is 1.70 euro.

You know what I just thought of? If these are not the exact same emitters, then how do we know if they are even the same wavelength as the ones we asked for? Is the original LG packaging present and labeled appropriately?

No, it is a matter of trust. I did check their earlier LG leds and they were dead-on 385nm. I could check these too but will not bother actually, it is not that the 385nm ones are more special or expensive than the 395 or 405 ones, I think that they know their leds but just don’t understand their customers.

That’s good enough for me. As many LEDs as you’ve tested over the years, if you can trust them, so can I. I don’t have any particular attachment to any particular wavelength anyway. I’m just buying these to play with. :smiley:

on the pic the dome looks taller than normal? is it the case, or just optical illusion?

So i got answere from the seller.

Like we could expect it is the lowest flux bin. But also the lowest Voltage bin with 3,2-3,4V. This should help to get a little bit more out of the leds.
At the moment there is only one person that has not payed and did not answere the PM. But i want to wait till tomorror. If i did not hear from him till then djozz and NeoGeo can have the leds. I do not know how much djozz or NeoGeo needs but that problem can be solved.

I’d be interested in 1-3.

So, how does this lowest bin of the newer gen compare with the LEDs we were originally expecting? Since you have the info now for these LEDs, I’m just curious what the output difference is. :innocent:

All leds are paid for. Sorry for all that are to late.
We do not know how much output they produce above 700mA (out of specs) but in spec there is not much difference in output to the old one he tested. Now we have to wait for djozz test to see how they perform above factory settings.

It is a pity that these are the lowest bin possible, I hoped for a more average bin. It should still be ~100 mW above the older generation led.

I do not know how well they perform above the specs. the thermal resistance is better than the older led, but I found in 365nm leds that the output of the die has a sharp output limit regardless of temperature, so temperature may not be the bottleneck. On the other hand, 385nm leds have a different type of die than 365nm leds so may have other characteristics as well.

In other words: only a test can tell, and I hope to check the led this weekend.