Updated my UV-led test method (=final), tested a Luminus SST-10 365nm led (and some others)

But is there a triple optic that will work with UV?

I got information Simon is using a LG UV LED in next Convoy UV batches, as the SST-10 UV 365nm are more expensive at same performance
it is listed with 1360mW@0.7A

and drive current on the G1performance group is 700mA und the H1 1500mA max. he got the one that’s only 0.7A, but I think it will run fine at 1.5A

https://www.lasercomponents.com/fileadmin/user_upload/home/Datasheets/lg/lg_uv_led_overview.pdf

^ Cool! I have been trying to find that led for sale for 2 years now, but I can’t find it in small quantities with normal shipping costs. I even emailed lasercomponents.com because they are distributor of LG UV leds, but had no luck getting samples from them.

ask Simon from Convoy for a test sample

Good idea!

No need, he already lists the led for sale. But his picture is an older generation of LG UV-leds than I thought it would be. Still cool to test but not the latest and greatest.

At least he has 2. best flux bin and 3. lowest voltage bin
960-1060mW @500mA is impressive

Djozz, this is a great thread! I applaud your efforts to find a repeatable measurement method. :+1:

Simon asked me for your shipping address to send you a free smaple djozz

this host with triple UV led and a DD driver will outperforming many high-end UV flashlight, i guess

Yes, could be a perfect combination, but the large diameter filter glass (ZWB2) is difficult to purchase.

Nice work, djozz. Would you care to update this thread by testing the LG UV-A 365 nm? I’d like to see it fare against the 365 nm UV LEDs in your test. I’m sure it will not top the Luminus SST-10, but I think it will beat the two Nichias. I’m not sure about the LiteON. I have the LG UV-A and I’m using it. The visible stray light of the LG is tolerable, maybe not as bad as the LiteON. I’m curious to see if getting the SST-10 is worth the extra price.

I have one of those LG leds in house to test but I’m waiting for the Seoel Semiconductors version from Kaidomain that is stuck in the mail somewhere, to do a test of both.

Yes, the one from Seoel Viosys, too. The CUN66A1A. I’m curious to see both of them in your test.

The SST-10 has no white wastelight and pretty few violett visible light, so an UV filter is not really nessesary

Have you considered using a diffraction grating to measure the output at a desired wavelength? All you would need is a slit at the calculated angle, and your detector behind it. You wouldn’t need all that filter stuff.

We’ll I am sure djozz will chime in but in order to do this your detector has to be sensitive to UV wavelengths and these are quite expensive. Djozz elegant solution is to convert the UV to visible wavelengths using the uranium glass so he can use regular inexpensive light meters to measure the intensity.

UV photodiodes are inexpensive too.
(https://shop.boselec.com/collections/uv-sic-sensors/products/sg01s-18)

True if you wanted to use an ordinary lux meter, a fluorescent material is needed. But with a grating there is no need for the visible light filter, and since 365nm is a component of sunlight, you don’t need the UV filter. The meter will either detect it (which is fine) or attenuate it.

Thanks for this detector exekutive and welcome to BLF. My brief search didn’t turn up any inexpensive flux meters using it but if you know of one please let us know. Wonder if you can just replace the sensor in one of those cheap meters? I see you haven’t posted much (neither have I) but that doesn’t mean you aren’t familiar with the forum. People here are focused on flashlights and budget so spending a few hundred dollars on test equipment is generally (not always) not an option. People are always receptive to new ideas so please do help us out with your knowledge of this topic.

In djozz setup the UV filter is to keep out stray UV from the flashlight, not from sunlight

Hi Scientist.
I realize that the UV filter was to keep UV out of his light meter. I was trying to explain how it isn’t necessary. (had a little typo there sorry).

I also realize that this is a flashlight forum, and that most people aren’t interested in this — in fact they probably won’t be reading this far down. My comments were directed at djozz or anybody who is interested in/might attempt this experiment.

The detector simply drives a current proportional to the incoming light. In fact they give you an example circuit right in the datasheet (it looks like about a dollar or two in parts). Coincidentally, the setup is very affordable and well within the budget range of somebody who can afford a fancy flashlight.