Learned something new today. Yes, Newton rings are indeed what I’m seeing.
Thus by placing 2 pieces of glass (the non-AR-coated glass lens and the ZWB2 filter) close together, there is indeed an air-gap between them that causes these Newton rings… I wonder which one is the slightly convex curved glass — the plain glass lens or the ZWB2 filter — more likely the ZWB2 filter?
Just reread this post - forgot to update -sorry. Upon further investigation I was told that AR coatings are not really efficient for UVA and result in a significant transmission loss, so I just dropped it (sadly don’t remember the details). Of course I’m sure there are specialty houses which can create very efficient coatings, but at a very inefficient price (I was quote a couple hundred for one piece, and a setup charge as I remember).
Been looking on aliexpress and there is a bunch of sellers of the stuff there.
Is this glass required for an LG3535LED? I bought it assuming it was much better than a chinese brand in regards to the visible light output.
Specs on the LED are 380-385nm, but i see other sellers selling it under different wavelenghts and I question whether or not hose ones are genuine.
I cant find any datasheet from LG either.
The filter is for eliminating visible light. The Nichias emit the least with others emitting somewhat more. The cheap ones are the worst. You will enjoy the light more if you get the inexpensive filter. ,
Yes im aware of that, I was trying to work out if the LG3535 puts out excessive visible light compared to the cheap chinese LEDs on the market.
Im wanting to use it on uranium glass most of the time and the odd time to cure UV resin.
i have found one hack for that, for testing it in the field, a cheap purple laser has tons of UV
you can even use it in day light
which no flashlight alone can overcome
Yes ive been over in laserpointerforums and quite a few are doing that with purple lasers.
Im currently building a blue laser with an M140 diode.
Will need to build a purple/violet laser to get the UV, i dont think 445nm lasers produce any.
Be very careful around other people with those, both direct and specular reflections.
The human eye is just barely sensitive to those wavelengths, which means it takes a heck of a lot of photons before your visual system tells your brain it’s seeing anything. But just because you can barely perceive the light output doesn’t mean it’s not transferring a lot of energy to the retina.