You don’t? I do see it from plants when I’m using my UV light. It’s not strong, but I do see it.
EDIT:
Last night I took one of my UV flashlights out and one my cameras. This is a comparison between a non-UV image (taken this morning) and a UV photo taken last night. The camera is a Sony a6500 with a 70mm Sigma Art lens. Had to push the ISO way up to get an image and the camera has trouble focusing with the UV light. I rotated the normal image to more-or-less line it up with the UV shot.
The UV light is a Jaxman U1n 365nm, which it looks like may have now been rebranded the U1c.
From poking around at things last night it looks like young leaves show more red than older leaves, and plants with thin protective membranes also show brighter than ones with thick memberanse. Mosses and algae are especially bright.
Also, a small spider. Had a lo of trouble getting it in focus, so it’s a bit off. This fellow is on a different plant with thicker, more waxy leaves and they don’t fluoresce nearly as strongly as the more delicate leaves on the false heather.