Old 01-10-2011, 08:35 PM #1
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Default Looking for UV LED lighting solutions (350-400nm)... whole lights or bare LEDs...

I have a thing at work that may require UV light to correctly analyze.
I brought my 405nm laser to work today and saw some good things... however building an LD array would seem to be very expensive (even using AW210 or PHR diodes). Plus, I don't necessarily need lasers - I only need relatively monchromatic longwave UV light.

What are my options regarding UV LED lighting? I'm thinking that UV LED is a better path to take versus UV flourescent lighting with UV output filters. What kind of power do LEDs output? I'd be looking to make an array that can put about 5W spread over an area of ~1 sq ft (about 53.8 W/m^2).

I'm looking either for bare LEDs (I can make my own small 100+ LED array) or whole flashlights arrays. If I build my own array I'll just use LM317 drivers.


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Old 01-11-2011, 02:54 AM #2
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Default Re: Looking for UV LED lighting solutions (350-400nm)... whole lights or bare LEDs...

First, see sig.

All of the UV LEDs I've tested are ~410nm. You may want to consider fluorescent or mercury vapor lamps. Fluorescents are generally more powerful, more efficient, simpler and cheaper. They peak around 370nm.
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Old 01-11-2011, 03:06 AM #3
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Default Re: Looking for UV LED lighting solutions (350-400nm)... whole lights or bare LEDs...

try this one
Amazon.com: 395 nM 51 UV Ultraviolet LED flashlight Blacklight 3 AA, 7202UV395: Home Improvement
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Old 01-11-2011, 06:06 PM #4
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Default Re: Looking for UV LED lighting solutions (350-400nm)... whole lights or bare LEDs...

dealextreme ones don't do the job? they have pretty strong (stated) emitters.
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Old 01-11-2011, 10:46 PM #5
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Default Re: Looking for UV LED lighting solutions (350-400nm)... whole lights or bare LEDs...

It would take about 5 4-dice versions of the nichia 365nm UV LED, or 20 of the ncsu033a LEDs, to output 5W optical power. Not cost effective.
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Old 01-11-2011, 11:08 PM #6
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Default Re: Looking for UV LED lighting solutions (350-400nm)... whole lights or bare LEDs...

In this post LarryDFW states he sells UV flashlights, might want to see what hes got:
>>link<<
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Old 01-12-2011, 06:13 AM #7
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Default Re: Looking for UV LED lighting solutions (350-400nm)... whole lights or bare LEDs...

Buy a black light fluorescent tube. I have a "10W" 365nm (peak "black light" wavelength) UV LED and the LED itself cost $110, the heatsink another $15. No, it does not put out 10W of radiant power, 10W is how much energy it uses in the conversion. From my initial tests on a thermopile power meter, I got about 350mW of radiant energy, but that was not with all of it focused on the meter nor was I blocking out all the heat it was producing (the Wood's glass UV pass filter I bought has its own efficiency too). It was probably putting out about 600mW according to the flux bin H that I was cited. Powering that thing is a pain too, at ~18V and 900mA. Everything about this LED is not what I had hoped for: expensive, hard to power, lots of heatsinking, not very portable, and low power (by comparison to a fluorescent bulb). It's neat as an esoteric LED, but that's about it for me.

These 10W LEDs are some of the highest output 365nm UV LEDs available, but the radiant output is still relatively low. You would be much better served with a fluorescent black light. They're cheaper, higher output, and readily available. Get a real one, not just one that puts out bluish light.

Last edited by Bionic-Badger; 01-12-2011 at 06:18 AM.
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