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Im not a pro but this article from Natures Rainbow, describes how brightness affects specimens next to each other not alone. There are great tips on this site or the Fluorescent groups Im in on Facebook. When i actually get some good photos with the new camera, Ill share the settings. All i need is time to work over making life work for me. More of my Feldspar with Chrysocholla does not glow a bright red than does as the agate ones do not glow a bright green.
https://www.naturesrainbows.com/single-post/2018/11/08/The-Feldspar-Effect---Is-This-Really-a-Fluorescent-Mineral?fbclid=IwAR1wz1iF0UuyofMq7M0M-yctpY4FA6mIgjZCup8I-rN1-3X_WRrPuENuTbw
https://www.facebook.com/groups/fluorescentminerals/

Pretty cool, John, thanks for all the info you posted today.

I make my own lights...
you can buy UV leds that have been sorted out by their wavelengths and get those deeper into it that don't shine purple
they put out almost all real UV not purple and so, you cant see the light - my light has 15 watts - VERY BRIGHT
[and i can get them higher, but cooling 15 watts of UV while out and about with battery is enough]

i really appreciate the links as who knows what i can find depending on where i go

im posting pics of my alexandrite pendent shot with new led technology & not expensive. These pics are very intense & make these stones 'explode' color wise-very cool!!!-

... talk about a red/green color change, UV or not that's fantastic.

Real nice pendent whatever the light is.

i have some high intensity UV cobs you can use.
the advantage is that they are deep enough you cant see the light
but they are VERY bright... so they make things pop..

will look and see what i have and let you know
cheap, easy... i wire them up myself...
[my idea was a walking stick for evening walks around the city... but alas, only a few diamonds show up red. and pariba i think comes up blue... but then again, would be interesting to see waht glows and what doesnt with a light that does NOT light up in visible spectrum]

UV loupe...
https://www.quicktest.co.uk/uv-loupe.htm