5 watt, 365nm flashlight - anybody see this one?

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pirateo40
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5 watt, 365nm flashlight - anybody see this one?

A China company (Bell Van) is advertising a 365nm, 5w flashlight based on what appears to be the CUN6GF1A chip from Seoul Viosys. The specs say 1150mw radiant, so it must be driven at 1000ma? A 5 watt would have to be driven at the max of 1400ma, but I have a hard time believing it is driven at 1400ma – I don’t see how the flashlight could handle the heat.
Supplied with a ZWB2 filter, priced around $25 (I’ve been told 3rd hand). I have an email inquiry into them to confirm.

Anybody have experience with this company or the Seoul chip?

http://www.lightingsforyou.com/365nm-375nm (scroll down)

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The Miller
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1400mA is 4 7135 chips, even a small S2+ can handle that heat, where the linked light has a bigger head and finning.

pirateo40
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Don’t know about that. The s2+ with the Nichia chip driven at 700ma get pretty warm. Driving the Seoul chip at its max rating of 1400ma is on the edge. Derating at 1400ma starts at 40C with excellent heatsinking, 10C with lousy heatsinking

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djozz
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$25 is a great price for a 1W radiant output 365nm flashlight with ZWB2 filter. I have not had one of those Seoul leds, but it has the standard 3535 footprint, so if you don’t trust the lifetime of the led, you could change the ledboard with a DTP board and vastly improve the thermal drain of the led. Or maybe a DTP board is already in there and that is how they get away with 1400mA.

mortuus
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interesting, too bad the host looks like complete shit.

pirateo40
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Maybe – I’ve sent an email asking for details on the driver and heatsink. Problem is I’ve never heard of this company and have no idea of the reliability

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djozz
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pirateo40 wrote:
Problem is I’ve never heard of this company and have no idea of the reliability

I think it a good sign that they provide the specsheet of the used led, that is better than I have ever seen before.
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With enough black coffee and cigarettes? all things are possible…

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pirateo40
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OK – just got the quote, very interesting = $25 in low qty. They use the CUN6GF1A Seoul Viosys chip, driven at 1000ma. Driving at 1400ma will overheat he says. Simple on/off driver, with ZWB2 filter. I’m going to order a couple and check them out. Sounds promising…. Will try to update here once I receive them.

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mortuus
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how much more powerful is it then convoys uv light ?

pirateo40
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1150mw vs 640mw (stated specs – radiant, not yet tested). Quite a bit more powerful. Of course reflector design will matter quite a bit. I ordered four of them to test/tear apart

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DB Custom
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FWIW, the most powerful UV 365nm emitter Nichia makes is the NVSU333A. It runs at 3800mA and makes a LOT of heat. And it sells for $108 for the emitter itself, if you can get it. I had to sign a waiver of release and submit an order on my company letterhead.

This is to say that it’s not easy, or cheap, to get a true high power UV emitter.

Edit: Here’s what the NVSU333A looks like…

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Yeah – 3640mw radiant. Almost need liquid nitrogen to cool Wink – Luckily in our application (mineral fluorescence) we don’t need pinpoint light sources. We’re not interested in throw but in a wide intense beam (floodlight). Pretty easy to hook up 3 or 4 of the cheaper LEDs and get close to the radiant (4ea Nichia 033 chips would give ~2500mw @$4 each). I built a 4 LED light using the LED Engin LZ1 parts for >6.5W radiant.

Here’s an example of the way we use these LEDs for mineral lights:

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DB Custom
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I have it mounted in a solid copper X6. Works well, I made a chunky aluminum “reflector” that gives a square hot spot but prefer to use it in mule configuration.

Edit: My primary point though was that if a company is declaring a “high output” UV emitter at a $25 price point something is probably amiss…

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I guess it depends on what you consider high output. A 9watt CFL (fluorescent) bulb outputs ~1.5w of UV (UVC or UVA). An LED which outputs radiant 1.5w UVA is considered pretty high output for us. Even the little Nichia 276 at 600 to 700mw but in a very tight beam, all radiated from a single point far exceeds the perceived power of a CFL bulb. So my focus is on replacing fluorescent bulbs where I can with these very directional LEDs. If only a reasonable UVC LED were in my future – sadly afraid not. 10mw/20mw just won’t cut it…

From a UV watts to dollar ratio I find the LZ1 part to be quite effective. But would drool to have what you describe – and mule config exactly what FL mineral collectors want. Did you also install a UV bandpass filter? With the $$$ you have invested in that light I would consider using Hoya 325c – the best filter you can get…

Mark

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DB Custom
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I had researched and located the Hoya lens but never bought it. Kinda like seeing the emitter in this copper light. (off, of course!)

Edit: From datasheets, the Hoya 360 would give a much sharper cut off for this Nichia, but where to find one in 35mm?

Edit II: I also have the LZ1 and a couple of the smaller Nichia’s, the LZ1 does perform well as does the little Jaxman offering in the U1 with it’s black bandpass filter lens.

Dale

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I cut all my Hoya glass. I have squares which I trim down to hexagons with a diamond saw, and then round it off using a lapidary wheel. The advantage of being a rock collector Smile

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DB Custom
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I too have the required diamond tools, just have to find the glass…

Dale

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so put an NVSU333A emitter insisde a c8 host would be a bad idea then?

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mortuus wrote:
so put an NVSU333A emitter insisde a c8 host would be a bad idea then?

Financially pretty bad, yes.
wle
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the chinese specs are pretty loose with their “W” ratings
i have seen a 1xAAA light called “5W”
so it may not mean what you think
or it might just be a lie

wle

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I realize this thread is a little old but I have to ask…so Mark, what happened? How did those lights work out? I have been avidly following your web pages since recently discovering them and that led me here looking for the latest developments in UV lights. I got the Convoy S2 on your recommendation and find it fantastic for UV rockhounding. Looking for the latest developments.

DB Custom
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The C8 also wouldn’t handle the heat of an 333A and the ultra expensive emitter would die. I have one in a solid copper X6, have to watch the heat still.

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OK, so how could one make a mobile light containing one or more Nichia 333A emitters?

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I think active cooling is the answer for portability

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DB Custom wrote:
The C8 also wouldn’t handle the heat of an 333A and the ultra expensive emitter would die. I have one in a solid copper X6, have to watch the heat still.

yeah I have planned to put the 333A in a Convoy C8 with a Bistro driver with relative low temperature stepdown at 45°C
I am not planning to go for FET DD on this one and play it save with 7135*12

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DB Custom
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I had to sign a letter of release on my company letterhead then pay Nichia $108 for the emitter itself.

If I remember correctly it’s running 3.8A on a PZL driver in a solid copper X6 (a mistake, was supposed to be the first copper X5)

Because of a very high Vf, I run a 4.35V Lg cell.

Edit: just got 3.18A at the tail on a freshly charged 4.35V LG that’s getting old.

Dale

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Received the NVSU233B-D4 365nm LED today

maybe they do a 333B with better efficiency that would be great

5.5W electrically, should be a bit less than 2W 365nm if its like the Datasheet normal flux bin
this has about 40% better efficiency than the 233A
on a fresh 18650-30Q it draws 1350mA

compared to a LiteOn 365nm @1050mA 50% overdriven on DTP star

that is already dedomed I can live with as its going into a reflector light
easiest to dedome LED ever its just held by 4 little glue spots


compared to the 276A you can see that the new ones have one electrode under the emitter

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DB Custom
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Sorry Scientist, for portability and max outputs with multiple 333A’s you would need to mount them on a sufficient heatsink with a linked fan for active cooling, or maybe utilize a PC liquid cooling system. So a box, with a multi cell power supply, would need to be constructed.

Dale

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Thanks DB. I am a real newb at this. I have been reading though and understand the problem better now. Your light looks really nice. Tell us how you like it. Must light the place up. I’ll have to read a lot more to translate what you are using for your light.

Lexel
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The 333A run in a host like the Convoy L6 would be enough cooling, maybe the buck driver can be modified and is fine with a 4.2V LED

if you are going for a multi LED light source there are cheaper ones like LiteOn with 3535 footprint fitting on Cree DTP MCPCBs
Those LEDs can deliver about 1W UV at the price of about 7$

the only drawback is you need a ZWB2 filter if you dont want the white wastelight this LED produces as well

http://www.mouser.com/ds/2/239/LTPL-C034UVH365%20DataSheet_Ver4_20150916...

here you can see multi LED DTP MCPCB
https://www.aliexpress.com/item/20mm-Cooper-PCB-Cree-XPG-XPG2-XPE-XPE2-X...

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