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LED UV emissions?

W

Wayne.

Jan 1, 1970
0
Just curious, but does an off the shelf white or blue LED emit any UV of
a usable level?

I use a CFL for UV exposure, but it is a PITA to set up, and for the
cost of one UV LED, I can by a bag of 10 ultra white or ultra blue LEDs.
 
T

Trevor Wilson

Jan 1, 1970
0
Wayne. said:
Just curious, but does an off the shelf white or blue LED emit any UV of a
usable level?

I use a CFL for UV exposure, but it is a PITA to set up, and for the cost
of one UV LED, I can by a bag of 10 ultra white or ultra blue LEDs.

**Even better, you can buy UV LEDs. They're not really UV, they're deep
purple, but they do the job. I've used them in place of unobtainable cold
cathode UV tubes.

Jaycar ZD-0260
Farnell 105-7106
 
C

Clint Sharp

Jan 1, 1970
0
Trevor Wilson said:
**Even better, you can buy UV LEDs. They're not really UV, they're deep
purple, but they do the job.
Just be careful not to overdrive them or you might get smoke on the
water.
 
W

Wayne.

Jan 1, 1970
0
Trevor said:
**Even better, you can buy UV LEDs. They're not really UV, they're deep
purple, but they do the job. I've used them in place of unobtainable cold
cathode UV tubes.

Jaycar ZD-0260
Farnell 105-7106

For the cost of one from Farnell, I can buy 10 blue/white LEDs.
 
I

ian field

Jan 1, 1970
0
Clint Sharp said:
Just be careful not to overdrive them or you might get smoke on the water.

The "stupid with a flare gun" inspired the only good single they ever did!
 
T

Trevor Wilson

Jan 1, 1970
0
Wayne. said:
For the cost of one from Farnell, I can buy 10 blue/white LEDs.

**You asked about UV, not white or blue. If you want UV, use a UV LED.
 
I

ian field

Jan 1, 1970
0
Trevor Wilson said:
**You asked about UV, not white or blue. If you want UV, use a UV LED.

You obviously didn't read what the OP said!
 
T

Trevor Wilson

Jan 1, 1970
0
ian field said:
You obviously didn't read what the OP said!

**I did. He clearly failed to read what I wrote. You want UV, use a UV LED.
I don't know how much UV is delivered by a blue or a white LED. I do, OTOH,
know that a UV LED delivers UV. A UV LED may deliver 10 (or 100) times the
amount of UV that a white or blue LED delivers.

It seems simple enough. He wants UV light, he uses UV LEDs.
 
B

Bob Parker

Jan 1, 1970
0
**Nice one Bob. Thanks for the link. I haven't tried these guys. Their
prices are pretty good.


I've bought quite a lot of stuff from Lance there. Excellent LEDs
and other things at good prices, in my experience. :)
 
J

Jasen Betts

Jan 1, 1970
0
For the cost of one from Farnell, I can buy 10 blue/white LEDs.

I seriously doubt that any blue/white ones emit more than a 2% UV.
but check for yourself farnell have links to data-sheets (and
most of them work)

wikipedia says UV is wavelengths smaller than 400nm, and a quick
search of a different site found no datasheets for visible light leds
that emit a measurable amount of UV

AIUI UV LEDs are made out of a different semiconductor to those used
for visible LEDs.
 
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