High power UV

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pinkpanda3310
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High power UV

Okay it’s really just an emitter swap. I used this led in a DQG v3 host.

I think I remember Dale having trouble removing the led pcb so I removed everything from the head and heated the whole head to reflow the leds.

After a quick clean with alcohol it looked good but I had to go back and heat it again because there was an open circuit on the board somewhere. Also I got the +/- around the wrong way again Facepalm

SUCCESS!

The violet colour seemed to screw with my phone camera because the following were shot in the same ambient light conditions. There is a ring around the handle of the draw that I sprayed with glow paint but the product was really cheap and nasty and hardly had any glow power in it.

I also have a UV pass filter, much to big for this host though Crying I don’t recall the exact specs of this thing but it seemed to accommodate my phone better. This is closer to what I actually see.

The difference between using the filter and not is interesting. With the filter is less visible blue/violet but also seeming less overall output.

I will need to wait for it to get dark before seeing the real potential of this Cool

DoubleA
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what wavelength UV leds are you using?

and on the first day he said "Let there be light"...

djozz
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that looks like one bright UV-light! Big Smile

the Cutter link refers to a 395nm led. The filter looks like what may be a ZWB2 filter? In that case it is not useful, the transmission peak is about 365nm, at 395nm it blocks 90%.

395nm leds need no filtering, unlike the 365nm leds they do not have waste light elswhere in the visible spectrum.

DoubleA
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You could have used 365nm uv led, it has very little blue/violet spill. Actually it’s spill looks more like white light.

I use it for currency detection and it works much better than 395nm.

and on the first day he said "Let there be light"...

pinkpanda3310
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365nM would have been nice but I was trying to keep costs down ~$5 for each led I used. Cutter only has 1 available 365nM led and it costs ~$150 for one.

You’re a smart guy djozz. I tracked down the filter specs, it is a ZWB3

So it’s roughly cutting the output by less than half.

stephenk
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What protective eyewear do you recommend for when using high power UV lights?

pinkpanda3310
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Lol, just like white led lights I just don’t look down the barrel Blushing

DoubleA
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It could still reflect a portion of that light, although it’s not that intense.

150$ for a single led? Shocked I bought mine at 4$ each from aliexpress.

and on the first day he said "Let there be light"...

everydaysurvivalgear
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The real question is what is the stain on draw door? lol Fire hosed it? Been playing helicopters? Silly

pinkpanda3310
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DoubleA wrote:
It could still reflect a portion of that light, although it’s not that intense.

150$ for a single led? Shocked I bought mine at 4$ each from aliexpress.


I mean no offence when I ask this but we’re you able to verify you got 365nM ? AliExpress doesn’t give me a whole lot of confidence.

I got some more rough phone pics. I recently got my daughter a decent camera… see if I can train her up to be my photographer Wink

pinkpanda3310
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I tried to gather a few colourful things together. It appears I don’t really have a lot of fluoro stuff. Some of the colours I would have expected to pop more but they didn’t. I really have no idea how that works. The difference between the turbo and mid pics below indicate that the camera is getting washed out to me (is that the right term?)

Turbo

Mid

Turbo with filter

Some glow powders and tape

Mid

I think this was Turbo or high with filter

And just plain glow (no uv light)

Be nice when I find a real world use for this…

Jensen567
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There are some decent 365nm LEDs on mouser with a 3535 XP type footprint, price is still double what you paid for these though. Specifically talking about the Lite-on 365nm UV and the Luminus SST-10 365nm UV.

djozz
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pinkpanda3310 wrote:
DoubleA wrote:
It could still reflect a portion of that light, although it’s not that intense.

150$ for a single led? Shocked I bought mine at 4$ each from aliexpress.


I mean no offence when I ask this but we’re you able to verify you got 365nM ? AliExpress doesn’t give me a whole lot of confidence.

I got some more rough phone pics. I recently got my daughter a decent camera… see if I can train her up to be my photographer Wink


Those cheap 365nm leds from aliexpress are between 365 and 370 nm, so close enough. The cheap features are that the output is ok but not great, and that they produce a white/yellow-ish waste light as well, that obscures the fluorescence that you usually want the UV for. Nichia 365nm leds are the best for producing almost no visible light.

A high output and fairly cheap 365nm led (more 365nm light than most Nichia’s) that does produce some visible light is the LiteOn 365nm led (available at Mouser and tme.eu). The visible light can be filtered out with a ZWB2 filter.

Btw, the plastic optic from the DQGtiny26650 likely absorbs a lot of 365nm light, so it was wise to go for 395nm. Smile

pinkpanda3310
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I was aware that some optics can interfere with the uv but i’m not fully versed with what goes on.

Lexel
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Normal TIRs will be absorb most 365nm and get burned

alpg88
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i had an itch for high power uv, build this one.
http://budgetlightforum.com/comment/1210061#comment-1210061

d_t_a
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stephenk wrote:
What protective eyewear do you recommend for when using high power UV lights?

I also have the same question.

Do those cheap anti-UVA/UVB ‘polarized sunglasses’ (many such sunglasses/night vision glasses in Banggood, for instance) offer some protection against UV light?

djozz
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depends a bit on what wavelength. The 395nm light from the light in the OP needs yellow /amber glasses, the 365nm leds can be be blocked quite well with common polycarbonate glasses (most ‘impact’ glasses used in workshops and labs are made of polycarbonate).

A quick test is always: shine the UV-source onto a sheet of copier paper, all UV sources should make it fluorescence bright blue. Then place the glasses in between light source and paper and see how much fluorescence is leftover, good glasses make it almost gone.

JIGHEADWORM
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I use uv strips on my boat for night fishing and some of the strips from China last about a month don’t know about individual leds anf how they will hold up in long run.

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I used a cheap $5 pair of yellow-lensed safety glasses from Wal Mart with my 395 UV light and they worked very well. They effectively blocked the majority of the visible blue making fluorescence pop much more vividly. Even dark items were more dramatic, such as leaves that fluoresced red, and tiny mushrooms and other fungus that was washed out in the blue. They also passed the paper test Djozz mentioned; shining through the lenses would eliminate fluorescence, and my eyes could feel the difference too.


Keepin’ the “B” in BLF

Don wrote:
It sounds like the XM LEDs won’t really be suitable for flashlight use. Pity…

DoubleA
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pinkpanda3310 wrote:

I mean no offence when I ask this but we’re you able to verify you got 365nM ? AliExpress doesn’t give me a whole lot of confidence.

I got some more rough phone pics. I recently got my daughter a decent camera… see if I can train her up to be my photographer Wink

It’s close enough, just like djozz said. I bought a whole bunch of different wave lenght uv leds from there from 365 to 410 so I know the difference they make. Only the 365nm led was able to match the performance of my mini uv cfl lamp when checking currency.

The case with aliexpress is that everything depends on the seller. Some are genuine while most others are not. Remember Convoy and Soshine have their official stuff sold through Ali.

and on the first day he said "Let there be light"...

DoubleA
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Lexel wrote:
Normal TIRs will be absorb most 365nm and get burned

Oh crap, I didn’t know this, was planning to use mine with a TIR.

and on the first day he said "Let there be light"...

Lexel
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PMMA TIR wont work there was a picture here in BLF that showed a ruined triple optic and LEDs were damaged as well

PMMA is a nice base material for deep UV protection glasses below 375nm
Polycarbonate glasses absorb anything below 395nm

pinkpanda3310
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Wow, so I’m really just lucky I used 400nm and not 365nm Crown

alpg88
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Lexel wrote:
PMMA TIR wont work there was a picture here in BLF that showed a ruined triple optic and LEDs were damaged as well

PMMA is a nice base material for deep UV protection glasses

it sure does work, i’ve build few uv lights using pmma tir lenses. have leds run for hours, no issues whatsoever.
i thinki know what picture you talking about, however it shows carclo triple, which is made of polycarb.

alpg88
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pinkpanda3310 wrote:
Wow, so I’m really just lucky I used 400nm and not 365nm Crown

has nothing to do with luck, polycarbonate lenses are ok from 400nm, and up, never had any uv led damage lenses, but than i never drive them beyond reccomended current, in most cases i drive them with even less current, uv leds are not nearly as tolerant to heat as white leds, so no overdriving, 365nm will be fine with pmma, done it more than once.

pinkpanda3310
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I just tried the polycarbonate (clear safety glasses) and paper trick. It did reduce the fluro pop some. I then tried with/without the optics and there didn’t seem to be much difference. Does that mean I could’ve used 365nm without issues?

alpg88
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pinkpanda3310 wrote:
I just tried the polycarbonate (clear safety glasses) and paper trick. It did reduce the fluro pop some. I then tried with/without the optics and there didn’t seem to be much difference. Does that mean I could’ve used 365nm without issues?

paper will glow at basically any wavelength, even blue light makes it glow a bit. find something else to test, id, or money, or something else that reacts to 365nm, but not to higher band.
also, are you sure your tir is not a pmma one? such 7up lenses are made by different brands, and some no name brands. also pmma is basically an acrylic plastic just not as brittle, acrylic does let lower than 400nm thru. simple common Plexiglas is acrylic.

pinkpanda3310
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I don’t follow?? Why do I need to test with 365nm specific colours when I have 400nm?

alpg88
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if you have 400, then forget about testing it, it will work with any lens\tir

pinkpanda3310
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Aah, so my question remains unanswered.

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