> On Dec 14, 2019, at 2:53 PM, gregebert <[email protected]> wrote: > > Very cool! How much current does the argon tube require ? My recollection is > that Argon radiates significantly less energy in the visible region compared > to neon.
As you age you lose your sensitivity to shorter wavelengths. Lunt Solar Systems used to get angry complaints from (older) customers because they literally couldn't see anything at the Calcium K line which has a wavelength of 393.4nm. That's definitely near-UV. I have a 24mW (tested power, not what some eBay seller claimed) 405nm "Blu-ray" laser and all I can see in a lit room is a spot on the wall. It has to be almost completely dark for me to faintly see the beam while sighting down the barrel. It's near the top of this post on my blog: https://www.astarcloseup.com/2011/08/laser-power-testing.html Terry Bowman, KA4HJH "The Mac Doctor" "If only you could see what I've seen with your eyes."—Roy Batty, Blade Runner -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/804274B3-C9E1-4963-BFC0-3BD59D70395E%40gmail.com.
