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|   April 10, 2009 at 10:19 PM

I don't mean to split hairs, but according to the Wikipedia article on UV, the wavelengths used for germicidal UV are 100-280nm. The description says these emit UV around 395-400nm (long wave UV-A). Can these actually be used for sterilization?

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|   June  5, 2009 at 2:48 AM

@mikedamage : despite what the description says only UVB (<320nm) can give you sun burns, and only UVC (<280nm) are germicidal.

Also, the Candela is a visible light intensity unit, it does not make much sense here.

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|   June 21, 2009 at 2:22 PM

is this led right in use for exposing pcb's?

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|   September  1, 2009 at 0:26 AM

I ordered two of these, received both today, however neither of them operate when applying 1.5 - 3vDc in the description. I even tried viewing through a UV sensitive camera, with no visible output.

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|   November 29, 2009 at 12:47 AM

Nice LEDs. You can see the beam with the naked eye though; I thought you couldn't see ultraviolet. Maybe it's just an indicator whether it is working or not.

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|   December  2, 2009 at 4:30 AM

@mikedamage : "(Mirei Mori ea) studied the possibility of using commercially available UVA-LED model for water sterilization. UVA-LED is capable of sterilization and should be available for use in sterilization equipment." They are talking about 365nm, their study is referenced in wikipedia's led article nr 43. They used NCCU033(T)from Nichia.com, which it seems was replaced by NCSU033A. www.momoalliance.co.jp makes lightblocks with 25 and 50 of these, but I can't find prices anywhere. To summarize, this LED here will NOT sterilize anything, but you needn't go down to 280nm either. Sparfun : when I get the prices I will direct them to you, perhaps you can add them to the offering ?

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|   December 30, 2009 at 9:50 AM

The leds are actually UVA, the pefect ultraviolet light for giving yourself a tan. You coul strap some to you face, and come to work with an "unkown disease." Or you could by a couple thousand and make and make a tanning booth.