You might be intersted in the following discussion.
Most of the LEDs you will find will be UVA not UVC light.
Hydro-photon, makers of the steripen, have been working on on one for a while now.
Here is an email I recieved from 2006 when I asked how there research was comming along.
Thanks for your inquiry and for your interest in SteriPEN. The LED
technology continues to develop and is moving along nicely. With this said
an LED version of SteriPEN will not be available in 2006. I'm sorry I can't
be more specific.
Director of Administration
I currently have their adventurer and love it, just waiting for them to come out with a pre-filter to fit the adventurer.