Bob Cowell said:
A few years ago I bought a couple of uv hand lights during Holloween.
And Mary Thiesse said:
Are led UV lights as harmful to the eyes as the flor. tube UV light? I'm
surprised that they would make a clip on for your cap.
Almost all of the generally
Well,
It is beginning to look like short wave UV is preferable, but not easily
created.
(Short wave UV LEDs seem to be made from unobtanium.)
I've found some good short-wave UV lights, but they do require more exotic
materials - as Mark Minton pointed out - and are a lot more expensive and
not LED
Don Cooper said:
So a less than ideal direction is probably where I'm heading - trying to find
the shortest wave UV LEDs available (350nm?)
Those will still be way too long wave for the best fluoescent minerals,
unfortunately.
does clear polycarbonate or 'Plexiglas' block UV light
The biggest selection of UV LEDs (and other oddball wavelength LEDs)
that I know of is a company in Austria:
http://www.roithner-laser.com/LED_diverse.htm
They have standard LEDs down to 350nm, but other specialized (meaning
VERY expensive) ones down to 255nm. Their price list is a little
Thank you Joe!
However - I am positive I cannot use their short UV wave LEDs... Way over my
budget.
It IS fascinating, though, that I could pay over $670 for an LED! But that
is how much a ball-lens 255nm TO-39 20 mA UV LED costs!
-WaV
On Sun, Jul 20, 2008 at 10:52 PM, Joe Mitchell
Don,
Is 400 to 405nm a good wavelength for fluorescing cave critters and
interesting cave minerals?
It may work for some critters and a few minerals, but for the really good
fluorescent effects you need a much shorter wavelength, on the order of 254 nm.
See, for example,
