Doug, we use the Aven
<https://www.aventools.com/product/provue-touch-white-uv-led-magnifying-lamp/>
lights that have a white ring and a UV ring of LEDs for touch-up and
inspection. Works great for us. They really love the ability to look at it
under white light first then switch to UV for inspection. Plus, we have
found every coating tends to glow differently regardless of the light. The
hard part is always getting the light in the right spot. That Aven ring in
conjunction with the "scorpion" lights everyone has in their smock pocket
is the popular choice for my people. I still do have a few old school desk
lamps with 14" UV tubes as well but they are not used very often. My
sprayer has an 18"  fluorescent tube trouble light that he can sweep over
the drying rack to look for dewetting.

Lloyd Duso
Plant Manager
Diamond-MT
(814) 535-3505
www.Diamond-mt.com

On Wed, May 2, 2018 at 4:12 PM, Douglas Pauls <
[log in to unmask]> wrote:

> OK, I have a conformal coating question being debated internally related to
> the wavelength of light used for black light inspection of conformal
> coating.  Fluorescent lights tend to emit more around 365 nm, which is
> where you get the most fluorescence from the dye.  I would like to use some
> of the new LED black lights, lower power, longer life, much brighter, but
> they emit in the 395-410 nm wavelength.  Seems to illumine the coating just
> as well, but am getting pushback from some areas of the company.  So, here
> is my question:
>
> Are there coating features or defects which you can see at 365 nm, which
> you cannot see at 395-410 nm?
>
> Doug Pauls
> Principal Materials and Process Engineer
> Rockwell Collins
>